False memories prime immune system for future attacks

IN A police line-up, a falsely remembered face is a big problem. But for the body's police force – the immune system – false memories could be a crucial weapon.

When a new bacterium or virus invades the body, the immune system mounts an attack by sending in white blood cells called T-cells that are tailored to the molecular structure of that invader. Defeating the infection can take several weeks. However, once victorious, some T-cells stick around, turning into memory cells that remember the invader, reducing the time taken to kill it the next time it turns up.

Conventional thinking has it that memory cells for a particular microbe only form in response to an infection. "The dogma is that you need to be exposed," says Mark Davis of Stanford University in California, but now he and his colleagues have shown that this is not always the case.

The team took 26 samples from the Stanford Blood Center. All 26 people had been screened for diseases and had never been infected with HIV, herpes simplex virus or cytomegalovirus. Despite this, Davis's team found that all the samples contained T-cells tailored to these viruses, and an average of 50 per cent of these cells were memory cells.

The idea that T-cells don't need to be exposed to the pathogen "is paradigm shifting," says Philip Ashton-Rickardt of Imperial College London, who was not involved in the study. "Not only do they have capacity to remember, they seem to have seen a virus when they haven't."

So how are these false memories created? To a T-cell, each virus is "just a collection of peptides", says Davis. And so different microbes could have structures that are similar enough to confuse the T-cells.

To test this idea, the researchers vaccinated two people with an H1N1 strain of influenza and found that this also stimulated the T-cells to react to two bacteria with a similar peptide structure. Exposing the samples from the blood bank to peptide sequences from certain gut and soil bacteria and a species of ocean algae resulted in an immune response to HIV (Immunology, doi.org/kgg).

The finding could explain why vaccinating children against measles seems to improve mortality rates from other diseases. It also raises the possibility of creating a database of cross-reactive microbes to find new vaccination strategies. "We need to start exploring case by case," says Davis.

"You could find innocuous pathogens that are good at vaccinating against nasty ones," says Ashton-Rickardt. The idea of cross-reactivity is as old as immunology, he says. But he is excited about the potential for finding unexpected correlations. "Who could have predicted that HIV was related to an ocean algae?" he says. "No one's going to make that up!"

This article appeared in print under the headline "False memories prime our defences"

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

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"Argo", "Lincoln" vie for Oscars crown in open race

LOS ANGELES - Steven Spielberg goes into next weekend's Oscars with the most nominations for his presidential "Lincoln" but the momentum is all with Ben Affleck's thriller "Argo" in the Academy Awards home straight.

And while the Hollywood veteran and the young pretender vie for the Oscars best picture crown, several other frontrunners remain hard on their heels, in one of the least predictable Oscar races in recent memory.

Taiwan-born Lee Ang's 3D spectacular "Life of Pi," Osama bin Laden manhunt movie "Zero Dark Thirty" and romcom "Silver Linings Playbook" could all be in with a chance at the Oscars, the climax of Tinseltown's annual awards season.

Spielberg and Lee are frontrunners for best director, while "Lincoln" star Daniel Day-Lewis is widely seen as a shoo-in for best actor. For best actress the hot money is on Jessica Chastain for her part in "Zero Dark Thirty" or "Hunger Games" star Jennifer Lawrence.

But Affleck's Iran hostage drama, despite only winning seven nominations -- against 12 for "Lincoln," 11 for "Life of Pi" and eight each for "Silver Linings Playbook" and "Les Miserables" -- has a clear edge for best picture.

It has swept up top prizes at a string of key awards shows, including the Golden Globes, the Screen Actors Guild (SAG), Producers Guild of America (PGA), the Directors Guild of America (DGA), and Britain's BAFTA last weekend.

Affleck has gotten used to making acceptance speeches over the last two months -- but he has been tightlipped on his prospects for the all-important 85th Academy Awards, to be held at Hollywood's Dolby Theatre next Sunday.

"I just feel so incredibly honoured to be nominated as a producer for this movie. To be here at the big party," he said at the Oscar Nominees Luncheon, the annual gathering of those in the race, held in Beverly Hills on February 4.

Indeed, his best picture nomination is as a co-producer of the film -- along with George Clooney and Grant Heslov -- rather than as a director, a category in which he was not nominated, in a perceived snub.

Snub or no snub, he will be among presenters at the show, along with a Who's Who of A-listers including Halle Berry, Sandra Bullock, Nicole Kidman, Reese Witherspoon, Robert Downey Jr, Samuel L Jackson, and Meryl Streep.

"Family Guy" creator Seth MacFarlane will be hosting, a move organizers hope will attract younger viewers among the hundreds of millions watching live around the world.

Other nominees presenting include Chastain -- best actress frontrunner for playing a relentless CIA agent on the hunt for Osama, in Oscar-winning director Kathryn Bigelow's controversial "Zero Dark Thirty".

But Lawrence, star of the "Hunger Games" blockbuster franchise, could also win the category for her portrayal of mixed-up Tiffany to Bradley Cooper's bipolar ex-teacher in "Silver Linings Playbook".

Cooper is up for best actor, along with Hugh Jackman for "Les Miserables", Joaquin Phoenix for "The Master" and Denzel Washington for "Flight" -- but Day-Lewis is widely forecast for a record third Oscar for his "Lincoln" turn.

For best director, 66-year-old Spielberg will be hoping for his first Oscar since "Saving Private Ryan" in 1999.

But he is up against Lee -- whose "Brokeback Mountain" won best picture in 2006 -- as well as Michael Haneke for his Cannes-winning "Amour", David O Russell for "Silver Linings Playbook" and Benh Zeitlin for "Beasts of the Southern Wild".

Best supporting actor nominees are Alan Arkin for "Argo", Robert De Niro for "Silver Linings Playbook", Philip Seymour Hoffman for "The Master", Tommy Lee Jones for "Lincoln" and Christoph Waltz for "Django Unchained".

For supporting actress Anne Hathaway is tipped to win for performance in "Les Miserables" -- including her heart-wrenching close-up rendition of "I Dreamed a Dream" -- against Amy Adams for "The Master", Sally Field in "Lincoln", Helen Hunt in "The Sessions" and Jacki Weaver in "Silver Linings Playbook".

The Oscars have a musical theme this year, including a performance by Britain's Adele singing the Oscar-nominated 007 theme tune "Skyfall" as well as by Shirley Bassey and Norah Jones, and Barbra Streisand, in her first Oscars turn since 1977.

- AFP/ir

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Internet rules: More cats. LESS CAPS

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

Our 12 Rules of the Internet

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STORY HIGHLIGHTS

• Yes, there ARE some rules to the Internet, though, for now they're mainly an inside joke


• Some rules based on pop culture, some have become Web memes


• Other rules ominously quote Anonymous


• Is there a need for rules on the vast and wild Web? Depends on where you stand

Editor's note: In the gallery above, we've selected a handful of our favorite Internet rules, or truths. (You might recognize a few.) What are some of yours? Tell us in the comments. We'll feature some of the best on CNN.

(CNN) -- Hello!

Welcome to the Internet. It's a big place, so let me show you around.

You're approaching Oversharing Pass, where residents routinely post too much information. The Facebook Gorge and Twitter Triangle are particularly nefarious time-sucks. Restraint is advised.

Up ahead is Hyperbole Junction, which is the Worst. Spot. Ever. We recommend that you maintain an even keel and stay to the center; the extreme left and right can be dangerous.

And over there is the infamous Lair of Sociopaths, the home of trolls and loners who mercilessly mock everyone who enters their territory. Watch your step: They may trip you up and you'll fall into the Chasm of Lulz.

Our world isn't all dangerous, of course. You may visit Squee City, where images of cute cats and laughing babies fill the landscape. You'll also meet countless kind strangers, hilarious raconteurs and hard-working fact-checkers. They make it all worthwhile.

Hmm. Maybe it would be easier if you had a guide -- you know, some rules to help you find your way.

What, you didn't know there are rules of the Internet?

Of course there are rules. How do you think we maintain order around here?

A parody of rules

That's a joke.

But there really are some rules of the Internet -- even if they, too, began as kind of a joke.

According to the site KnowYourMeme.com, the Rules began around 2006 as a guide for the Internet collective Anonymous and emerged on the old Encyclopedia Dramatica, a bawdy meme catalog. Soon a version emerged on 4chan, an online bulletin board where most users post anonymously, says Jamie Cohen, director of web/digital media at Hofstra University's School of Communication.

"Chris Poole (4chan's founder) kind of designed it, kind of like a Netiquette rules," he says, describing the unspoken code of conduct that lubricates Internet discourse. (Poole has attributed the rules to Gaia Online, a role-playing community.)

But the rules of the Internet deliberately mocked many of those conventions. The self-reflexive parody fit perfectly with its community's attitude, points out Anthony Rotolo, a professor at Syracuse University's School of Information Studies.

"These jokes are meant to comment on something happening in the world," he says. "Later they get accepted as truisms or become a meme."

The absurdity has been reflected even in the supposed number of rules. Though the best-known first version claimed there were 50 rules, only 18 were listed. Number 1 was initially "Do not talk about Rules 2-33"; no Rules 2-33 were on the list.

The sarcastic attitude was reinforced by the kicker found on Encyclopedia Dramatica. It was a parody of Wikipedia's stub language: "This article is crap. You can help by completely re-writing it."

'Fight Club' and Monty Python

Very quickly, the lists started multiplying and expanding, liberally borrowing from comedy, Web culture and math-science tropes. On one list, a few were designated by complex numbers and mathematical symbols. Some were observations; others were directives.

Some have traced the Internet rules to Chris Poole, the founder of 4chan.

Two rules were taken from "Fight Club": "You do not talk about 4chan (or "/b/," 4chan's random, free-wheeling bulletin board) and "You DO NOT talk about 4chan." One version of Rule 6 stated "There is no Rule 6," which is from a Monty Python sketch. Rule 42, "Always bring a towel," was drawn from Douglas Adams' "The Hitchhiker's Guide to the Galaxy" series. (If you have to ask, read the books.) "Profit," Rule 49, came from "South Park."

Other rules went the reverse direction and became part of mainstream culture. Rule 34 -- "If it exists, there is porn of it" -- is likely the most famous. But there's also "Pics or it didn't happen" (Rule 30), "For every given male character, there is a female version of that character; conversely for every given female character, there is a male version of that character" (Rule 63) and, of course, the corollary to Rule 34 -- "If no porn of it exists at the moment, it will be made" (Rule 35).

Most retained a sense of humor, riffing off established rules and occasionally ending with a giggly "No exceptions."

But a handful were, and remain, as serious as a judge -- notably the three directly about Anonymous (commonly Rules 3-5):

- We are Anonymous.

- We are legion.

- We do not forgive, we do not forget.

The overall Internet rules may have started as a joke, but such ominous language from Anonymous speaks to some of the paradoxes of the Web:

Rules? Why do we need some stinkin' rules?

After all, rules can be helpful -- or divisive. They can create community -- or subvert it.

Even Anonymous, the activist group itself, cuts both ways, says Rotolo. When it hacked the extremist Westboro Baptist Church, many people cheered. But when it goes after less unpopular targets, some cry vigilantism.

Cohen says that the rules themselves try to have it both ways. They're funny until someone gets hurt.

They "play more of a game type of role. They can be bent or broken or cheated or moved around, as you would in any game that has no physical reaction," he says. "That doesn't take into account ever the result of real people being affected by this -- such as teenagers, children, anybody who's seeing things that they shouldn't."

He adds, "There's a lot of rules in there that work for (the creators) more than anyone else. Until they become victims of their own thing, they don't know how powerful the rules are."

Evolving from the Wild West

Of course, the Internet isn't that old, and we're still in its Wild West era in many ways. As the technology evolves from a handful of hackers on Usenet bulletin boards to billions of users on officially sponsored sites, the customs -- the rules -- of the Web will evolve with it.

But we're not talking about the kinds of changes that your family makes to the rules of Monopoly (no, Free Parking is NOT for the pool of money acquired via Chance and Community Chest). We're talking something more expansive: All the established customs of our carbon-based life forms, making way for the instantaneous and virtual modes of silicon-based electronics.

Who knows what new rules may be written?

"When you're in the midst of social change, it's impossible to determine where it's going," says Peter S. Vogel, a former programmer who's now a Dallas-based attorney. "And I think we are in the greatest social change in the history of humans, because there are no boundaries of geography or time."

We haven't even sorted out what happens when the differences in local culture meet global technology. Bruce Umbaugh, a philosophy professor at Webster University in St. Louis who teaches a course on philosophy and technology, argues that not all parts of the world are as tolerant or open-minded as Western democracies.

There's a lot of rules in there that work for (the creators) more than anyone else.
Jamie Cohen, Hofstra University

"There are a lot of other places in the world that are actively using the technology of the Internet to control the free communication among citizens, and to identify critics of the government and hurt them," he says. "We need to be mindful in what we advocate from our perspective that the tools that are implemented on the Net are tools for the global Net."

In other words, citizens of other countries already face actual, enforceable rules -- unlike the folkways established by Web users in the West. Witness the frictions of the Arab Spring, or the restrictions of societies such as North Korea.

It's the kind of perspective that provides a different context for the issues raised by a libertarian, anything-goes Internet. It's hard enough to stop "Star Wars" comment boards from devolving into flamebaiting, meme-generating files of NSFW Yodas.

So for now, we're still making our way through the Series of Tubes, and nobody knows where the boundaries lie. We joke, we grimace and we marvel at the creativity of the hive mind. The Internet is a big place, and countless cultures have set up residence. Eventually, what is now humor may lose its zing; what are now customs may become laws.

Will the rules ever become The Rules? Maybe some future generation will figure out the true guideposts of Internet life, and the singularity will be upon us.

Nah. It'll never happen.

What did we miss? Share your rules for the internet below in the comments. We'll feature some of the best on CNN.

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2 firefighters dead, 2 hurt in Texas lodge fire

BRYAN, Texas Two Texas fire lieutenants have died of burns after battling a lodge hall fire, a city official said Saturday.

Greg Pickard and Eric Wallace, both with the department in the Central Texas city of Bryan, were in a group of firefighters responding to the blaze about midnight Friday at a Knights of Columbus hall, city spokeswoman Mary Lynne Stratta said.

The team entered the burning building but didn't emerge when ordered to evacuate, Stratta said.

Wallace, 36, died at the scene and Pickard, 54, on Saturday at a hospital in Galveston, she said.

"He called for help, said he was low on air," Stratta said of Wallace, a 13-year Bryan Fire Department veteran.

With Wallace still inside, Pickard and two other firefighters — Ricky Mantey Jr. and Mitchel Moran — were sent in to rescue him when the roof collapsed in flames, Fire Chief Randy McGregor said.

Rapid response units found the men inside the building. Mantey, 30, and Moran, 21, also were injured. They were taken to the Galveston hospital with burns. On Saturday, Stratta said they were both in serious but stable condition.

The Texas State Fire Marshal's office is investigating the cause of the fire in Bryan, about 90 miles northwest of Houston. A news release from the city said nothing was being held at the hall at the time.

"These four courageous individuals represent the best of the profession and are true heroes in every sense of the word," McGregor said.

Services for Wallace are scheduled for Thursday in Bryan, while those for Pickard, a 32-year veteran of the department, are pending.

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Meteor Blast 'Something We Only Saw in Movies'

A day after a massive meteor exploded over this city in central Russia, a monumental cleanup effort is under way.

Authorities have deployed around 24,000 troops and emergencies responders to help in the effort.

Officials say more than a million square feet of windows -- the size of about 20 football fields -- were shattered by the shockwave from the meteor's blast. Around 4,000 buildings in the area were damaged.

The injury toll climbed steadily on Friday. Authorities said today it now stands at more than 1,200. Most of those injuries were from broken glass, and only a few hundred required hospitalization.

According to NASA, this was the biggest meteor to hit Earth in more than a century. Preliminary figures suggest it was 50 feet wide and weighed more than the Eiffel Tower.

SEE PHOTOS: Meteorite Crashes in Russia

NASA scientists have also estimated the force of the blast that occurred when the meteor fractured upon entering Earth's atmosphere was approximately 470 kilotons -- the equivalent of about 30 Hiroshima bombs.

Residents said today they still can't believe it happened here.

"It was something we only saw in the movies," one university student said. "We never thought we would see it ourselves."

Throughout the city, the streets are littered with broken glass. Local officials have announced an ambitious pledge to replace all the broken windows within a week. In the early morning hours, however, workers could still be heard drilling new windows into place.

Authorities have sent divers into a frozen lake outside the city, where a large chunk of the meteor is believed to have landed, creating a large hole in the ice. By the end of the day they had not found anything.

They are not the only ones looking for it.

Meteor hunters from around the world are salivating at what some are calling the opportunity of a lifetime. A small piece of the meteor could fetch thousands of dollars and larger chunks could bring in even hundreds of thousands.

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False memories prime immune system for future attacks

IN A police line-up, a falsely remembered face is a big problem. But for the body's police force – the immune system – false memories could be a crucial weapon.

When a new bacterium or virus invades the body, the immune system mounts an attack by sending in white blood cells called T-cells that are tailored to the molecular structure of that invader. Defeating the infection can take several weeks. However, once victorious, some T-cells stick around, turning into memory cells that remember the invader, reducing the time taken to kill it the next time it turns up.

Conventional thinking has it that memory cells for a particular microbe only form in response to an infection. "The dogma is that you need to be exposed," says Mark Davis of Stanford University in California, but now he and his colleagues have shown that this is not always the case.

The team took 26 samples from the Stanford Blood Center. All 26 people had been screened for diseases and had never been infected with HIV, herpes simplex virus or cytomegalovirus. Despite this, Davis's team found that all the samples contained T-cells tailored to these viruses, and an average of 50 per cent of these cells were memory cells.

The idea that T-cells don't need to be exposed to the pathogen "is paradigm shifting," says Philip Ashton-Rickardt of Imperial College London, who was not involved in the study. "Not only do they have capacity to remember, they seem to have seen a virus when they haven't."

So how are these false memories created? To a T-cell, each virus is "just a collection of peptides", says Davis. And so different microbes could have structures that are similar enough to confuse the T-cells.

To test this idea, the researchers vaccinated two people with an H1N1 strain of influenza and found that this also stimulated the T-cells to react to two bacteria with a similar peptide structure. Exposing the samples from the blood bank to peptide sequences from certain gut and soil bacteria and a species of ocean algae resulted in an immune response to HIV (Immunology, doi.org/kgg).

The finding could explain why vaccinating children against measles seems to improve mortality rates from other diseases. It also raises the possibility of creating a database of cross-reactive microbes to find new vaccination strategies. "We need to start exploring case by case," says Davis.

"You could find innocuous pathogens that are good at vaccinating against nasty ones," says Ashton-Rickardt. The idea of cross-reactivity is as old as immunology, he says. But he is excited about the potential for finding unexpected correlations. "Who could have predicted that HIV was related to an ocean algae?" he says. "No one's going to make that up!"

This article appeared in print under the headline "False memories prime our defences"

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

If you are having a technical problem posting a comment, please contact technical support.

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Alleged cop killer died from single shot to head

LOS ANGELES: Alleged US cop killer Christopher Dorner died from a single gunshot wound to the head that appeared to be self-inflicted, a coroner said.

The doctor who examined the body concluded that "the cause of death was a single gunshot wound to the head," said San Bernardino County coroner Kevin Lacy, giving details from the results of a six-hour autopsy.

"We are not yet able to speak about the manner of death and tell you whether or not it was the result of a self-inflicted wound or another round," he told a press conference.

But he said, "while we are still assembling the reports and putting it together, the implication seems to be that the wound that took Christopher Dorner's life was self-inflicted."

The ex-Los Angeles Police Department (LAPD) cop went on the run last week after allegedly killing a couple and a policeman, and wounding three people. Another officer was killed and one wounded before the cabin in which Dorner was holed up burned in a fire.

Dorner had posted online a chilling manifesto in which he threatened to kill policemen and their families, and blamed the LAPD for treating him unfairly in his sacking in 2008.

The manhunt came to a climax Tuesday in a cabin near a snow-covered ski resort, after Dorner was spotted in a stolen vehicle and then fled on foot after crashing one vehicle and carjacking another.

San Bernardino County Sheriff John McMahon said that there was a prolonged firefight with the 33-year-old, who barricaded himself in the cabin after a six-day manhunt.

When they had exhausted other means, SWAT officers used a tractor-type device to open up the windows and walls of the cabin, and inserted a pyrotechnic chemical, to try to force Dorner to surrender.

A blaze erupted, starting at one corner of the cabin. As the flames took hold, after a period of no firing, "We heard a distinct single gunshot coming from inside the house," said McMahon.

The sound of it "indicated to me (that) a different kind of weapon had been fired," he added.

- AFP/ck

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Sen. Rubio drowning in 'water-gate'

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Facebook says it was hacked last month

Social media company Facebook announced Friday that it was hacked last month, which has led to an ongoing investigation.

Below is a statement issued by Facebook:

Last month, Facebook Security discovered that our systems had been targeted in a sophisticated attack. This attack occurred when a handful of employees visited a mobile developer website that was compromised. The compromised website hosted an exploit which then allowed malware to be installed on these employee laptops. The laptops were fully-patched and running up-to-date anti-virus software. As soon as we discovered the presence of the malware, we remediated all infected machines, informed law enforcement, and began a significant investigation that continues to this day. We have no evidence that Facebook user data was compromised in this attack.

class="regBQ">

This article originally appeared on CNET.

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Carnival Cruise Ship Hit With First Lawsuit

The first lawsuit against Carnival Cruise Lines has been filed and it is expected to be the beginning of a wave of lawsuits against the ship's owners.

Cassie Terry, 25, of Brazoria County, Texas, filed a lawsuit today in Miami federal court, calling the disabled Triumph cruise ship "a floating hell."

"Plaintiff was forced to endure unbearable and horrendous odors on the filthy and disabled vessel, and wade through human feces in order to reach food lines where the wait was counted in hours, only to receive rations of spoiled food," according to the lawsuit, obtained by ABCNews.com. "Plaintiff was forced to subsist for days in a floating toilet, a floating Petri dish, a floating hell."

Click Here for Photos of the Stranded Ship at Sea

The filing also said that during the "horrifying and excruciating tow back to the United States," the ship tilted several times "causing human waste to spill out of non-functioning toilets, flood across the vessel's floors and halls, and drip down the vessel's walls."

Terry's attorney Brent Allison told ABCNews.com that Terry knew she wanted to sue before she even got off the boat. When she was able to reach her husband, she told her husband and he contacted the attorneys.

Allison said Terry is thankful to be home with her husband, but is not feeling well and is going to a doctor.

Carnival's Triumph Passengers: 'We Were Homeless' Watch Video

Girl Disembarks Cruise Ship, Kisses the Ground Watch Video

Carnival Cruise Ship Passengers Line Up for Food Watch Video

"She's nauseated and actually has a fever," Allison said.

Terry is suing for breach of maritime contract, negligence, negligent misrepresentation and fraud as a result of the "unseaworthy, unsafe, unsanitary, and generally despicable conditions" on the crippled cruise ship.

"Plaintiff feared for her life and safety, under constant threat of contracting serious illness by the raw sewage filling the vessel, and suffering actual or some bodily injury," the lawsuit says.

Despite having their feet back on solid ground and making their way home, many passengers from the cruise ship are still fuming over their five days of squalor on the stricken ship and the cruise ship company is likely to be hit with a wave of lawsuits.

"I think people are going to file suits and rightly so," maritime trial attorney John Hickey told ABCNews.com. "I think, frankly, that the conduct of Carnival has been outrageous from the get-go."

Hickey, a Miami-based attorney, said his firm has already received "quite a few" inquiries from passengers who just got off the ship early this morning.

"What you have here is a) negligence on the part of Carnival and b) you have them, the passengers, being exposed to the risk of actual physical injury," Hickey said.

The attorney said that whether passengers can recover monetary compensation will depend on maritime law and the 15-pages of legal "gobbledygook," as Hickey described it, that passengers signed before boarding, but "nobody really agrees to."

One of the ticket conditions is that class action lawsuits are not allowed, but Hickey said there is a possibility that could be voided when all the conditions of the situation are taken into account.

One of the passengers already thinking about legal action is Tammy Hilley, a mother of two, who was on a girl's getaway with her two friends when a fire in the ship's engine room disabled the vessel's propulsion system and knocked out most of its power.

"I think that's a direction that our families will talk about, consider and see what's right for us," Hilley told "Good Morning America" when asked if she would be seeking legal action.

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Sand-grain-sized drum extends reach of quantum theory

The banging of a tiny drum heralds the intrusion of the weird world of quantum mechanics into our everyday experience. Though no bigger than a grain of sand, the drum is the largest object ever to have been caught obeying the uncertainty principle, a central idea in quantum theory.

As well as extending the observed reach of quantum theory, the finding could complicate the hunt for elusive gravitational waves : it suggests that the infinitesimal motion caused by these still-hypothetical ripples in spacetime could be overwhelmed by quantum effects.

The uncertainty principle says that you cannot simultaneously determine both a particle's exact position and momentum. For example, bouncing a photon off an electron will tell you where it is, but it will also change the electron's motion, creating fresh uncertainty in its speed.

This idea limits our ability to measure the properties of very small objects, such as electrons and atoms. The principle should also apply to everyday, macroscopic objects, but this has not been tested – for larger objects, the principle's effects tend to be swamped by other uncertainties in measurement, due to random noise, say.

Quantum drum

To extend the known reach of the uncertainty principle, Tom Purdy and colleagues of the University of Colorado, Boulder, created a drum by tightly stretching a 40-nanometre-thick sheet of silicon nitride over a square frame with sides of half a millimetre – about the width of a grain of sand. They placed the drum inside a vacuum chamber cooled to a few degrees above absolute zero, minimising any interference by random noise.

By continuously firing a stream of photons at the drum they were able to get increasingly precise measurements of the position of the skin at any moment. However, this also caused the skin to vibrate at an unknown speed. When they attempted to determine its momentum, the error in their measurement had increased – just as the uncertainty principle predicts.

"You don't usually have to think about quantum mechanics for objects you can hold in your hand," says Purdy.

That the uncertainty principle holds sway at such a large scale could affect the hunt for gravitational waves, which are predicted by Einstein's theory of general relativity but have never been detected.

Mitigation strategy

Gravitational wave detectors look for very slight changes in the distance between two test masses caused by passing spacetime ripples. Purdy says his team's experiment confirms long-held suspicions that quantum uncertainty could overwhelm these very small changes.

Now he and others can use the drum to explore more advanced measurement techniques to mitigate the effects. For example, uncertainty in an object's momentum could lead to future uncertainty in its position and there should be ways to minimise such knock-on effects. "You can't avoid the uncertainty principle, but you can in some clever ways make it [such that] increasing the momentum doesn't add back to the uncertainty in position at a later time," says Purdy.

His experiment is a neat demonstration of the breakdown of the traditional notion that the atomic world is quantum while the macroscopic world is classic, says Gerard Milburn of the University of Queensland in Brisbane, Australia, who was not involved in the work. Previous, attempts to blur the quantum-classical divide have involved entangling diamonds and demonstrating quantum superposition in a strip of metal.

Despite these feats, Milburn doesn't rule out the prospect of a breakdown on really large scales. "Of course maybe one day we will see quantum mechanics fail at some scale. Testing it to destruction is a good motivation for going down this path," he says.

Journal reference: Science, DOI: 10.1126/science.1231282

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COE second open bidding exercise 18 February

SINGAPORE: February's Certificates of Entitlement (COEs) second open bidding exercise opens on Monday at noon.

The tender closes on Wednesday at 4pm.

The total quota available for this tender exercise is 1,608.

Non-transferable categories:

Category A : Cars (1,600cc and below) - 333

Category B : Cars (1,601cc and above) - 303

Category D : Motorcycles 506

Transferable categories:

Category C : Goods Vehicles and Buses - 225

Category E : Open Category - 241

- CNA/ck

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Mom of boy held in bunker is worried

STORY HIGHLIGHTS

• Phil McGraw speaks with mother of former Alabama child hostage


• She tells him she worried about trying to put him back on a school bus


• Ethan told her the Army killed the 'bad man'


• The 6-year-old tells his mom that 'My bus driver is dead'

(CNN) -- Jennifer Kirkland says she caught her 6-year-old son Ethan just staring at a school bus the other day.

He was mesmerized, his eyes locked on the yellow vehicle. He didn't say a thing, and she didn't know what to say to him.

The last time he was on a bus, he was sitting just behind the driver -- as he always did -- waiting for his stop so he could go home.

But the "bad man" got on, and killed the driver, his buddy Mr. Poland.

Appearing on the "Dr. Phil" show, Kirkland told Phil McGraw she was worried how her little boy was going to react the next time she tried to put him on the bus to school.

After being kidnapped, the recovery ahead

Photos: Alabama bunker standoff

HIDE CAPTION

Ethan has been having a hard time sleeping, she told the psychologist turned syndicated daytime talk show host.

He thrashes his arms, tosses and turns and sometimes he calls out.

It has only been almost 10 days since the FBI sent a rescue team into the bunker in Midland City, Alabama, where Ethan was held hostage for nearly a week by Jimmy Lee Dykes.

His mother hasn't asked Ethan what happened when he was there.

"I have not talked to Ethan about it," she said in an interview aired Wednesday. "I don't know how to. As a mother I want him to know that I'm there if he needs to talk. I don't know how to respond because I have never been through this."

Inside the bunker: From storm shelter to boy's prison

Ethan has seen two people shot to death. Dykes shot bus driver Charles Poland several times before he carried Ethan, who had fainted, off the bus and into an underground bunker Dykes had built on his property.

Then the FBI killed Dykes when negotiations broke down and authorities felt they had to rescue the boy before Dykes, who had a handgun, did something rash.

"The Army came in and shot the bad man," Kirkland said Ethan told her.

Kirkland said she had hoped Dykes wouldn't be harmed.

"From the very beginning, I had already forgiven Mr. Dykes even though he had my child," she said. "I could not be angry through this. My job was to be the mother."

She thinks Dykes had a soft spot for Ethan because he has disabilities. Dykes took care of her boy as best he could, she said.

He even fried chicken for the boy.

Still, as the crisis continued, she worried that Dykes might be spooked by something her child did -- or that he had enough supplies to stay down there for months. She worried her boy would think she had abandoned him.

She asked authorities to let her speak to Dykes.

"That's my baby. He's my world. He's my everything," she said. "Everything I do I do for him. And I was afraid I wasn't going to get him back."

When she did get him back, he was in the hospital, putting stickers on everyone in sight.

"Hey, bug, I sure have missed you," she recounted.

"I missed you, too," he answered.

FBI: Bombs found in Alabama kidnapper's bunker

Now she worries that even though he seems like the same playful little boy, there is an emotional storm ahead.

McGraw told her to talk to Ethan about his feelings, not what happened to him in the bunker.

"Let that decay in his young mind," he said.

McGraw asked Ethan a few questions, but as 6-year-olds are apt to do, he answered most with a "Yes" or a "No."

But when the doctor asked him how he got to school, Ethan said, "On my bus, but my ..."

Then he walked over to his mother and as if telling a secret, whispered in her ear, "But my bus driver is dead."

Kirkland told McGraw that it was Poland who helped Ethan conquer his fear of descending the steep school bus steps. Poland would cheer Ethan on and one day when the child hesitated and the mother went to help, the driver said, "Let him do it."

Since then, Ethan has had no problem.

But now his cheerleader won't be there, and Kirkland is anguished about her boy.

"Mr. Poland put him behind him so he could keep a good eye on him," she said.

Ethan hasn't been back to school yet. He's been busy opening birthday presents and playing with his favorite toys. On Wednesday, he made a new friend in Gov. Robert Bentley.

There's a picture from the event where little Ethan is sitting underneath the governor's desk. The child is beaming.

"Ethan is a loving, forgiving child," Kirkland said. "He is easy to go up to a perfect stranger and say, 'Can I have a hug?'"

That was the boy who went into that bunker. She is concerned it's not the child who came out.

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Body in burned cabin ID'd as Christopher Dorner

(CBS News) BIG BEAR LAKE, Calif. - Remains of a man who was in a burned California cabin on Tuesday have been positively identified as belonging to that of Christopher Dorner, the former LAPD officer who was suspected of killing four people and was the subject of an intense manhunt, officials confirmed.

The San Bernardino County Coroner's office said the positive identification was made through dental records.

The final hours of the manhunt for Christopher Dorner began when Jim and Karen Reynolds opened the door of one of their rental condos.

Police fill in the blanks on Dorner's last day
Carjacking victim: Christopher Dorner told me "I don't want to hurt you"
Deputy slain in ex-cop shootout was new father

"We had come into the living room and he opened the door and came out at us," said Karen.

"He had the gun drawn," added Jim.

A man believed to be Dorner tied them up.

"He talked to us, trying to calm us down," said Karen, "and saying very frequently he would not kill us."

He then took their car. "We listened for probably a minute or two, wanted to make sure he was gone," said Jim, "sounded quiet. And then we started struggling trying to get loose."

They called 911, triggering a chain of events that ended with Tuesday's shootout in which two sheriffs deputies were shot. Thirty-five-year-old Jeremiah MacKay died from his wounds.

The firefight that we witnessed was intense and we were forced to take cover - however, we left his cell phone on. Early in the standoff you could hear officers suggesting burning the suspect out.

One officer can be heard saying, "Burn that ------ out , burn it down, ------ burn this mother-----"

Four more hours would pass before police used high-powered tear gas. The canisters are known to be a fire hazard.

"We did not intentionally burn down that cabin to get Mr. Dorner out," San Bernandino Sheriff John McMahon had said.

Dorner's body was found in the ashes. It's unclear if the cause of death was from the fire -- or a single shot we heard moments after the cabin ignited.

Meanwhile, investigators looking through a trash bin in Irvine, California, where the first two victims were killed, recovered Dorner's badge, a police uniform, and a high-capacity ammo magazine.

CBS News asked San Bernardino County Sheriff's Department about the audio we recorded, and they declined to comment.

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Dorner Confirmed Dead in Autopsy on Cabin Remains

Christopher Dorner, the ex-Los Angeles police officer who declared himself on a killing spree against his former law enforcement colleagues, is dead.

Authorities this evening confirmed that remains found after a fiery standoff at a California mountain cabin Tuesday were, in fact, Dorner's.

"The charred human remains located in the burned out cabin in Seven Oaks have been positively identified to be that of Christopher Dorner," the San Bernardino County Sheriff-Coroner's Office said in a written statement. "During the autopsy, positive identification was made through dental examination."

FULL COVERAGE: Christopher Dorner Manhunt

PHOTOS: Former LAPD Officer Suspected in Shootings

In a 6,000-word "manifesto," Dorner outlined his anger at the Los Angeles Police Department for firing him, and made threats against individuals he believed were responsible for ending his career with the police force five years ago. Dorner was fired after filing what the LAPD determined to be a false report accusing other cops of brutality.

Dorner is suspected of killing four people, including Monica Quan and her fiance, who were found shot to death Feb. 3. Quan was the daughter of former LAPD Capt. Randal Quan, who was mentioned as a target of Dorner's fury in the manifesto.

Christopher Dorner Hostages: 'He Just Wanted to Clear His Name' Watch Video

Christopher Dorner Believed Dead After Shootout With Police Watch Video

Christopher Dorner Believed Dead After Shootout with Police Watch Video

Dorner is also suspected in the shooting death of Riverside, Calif., Police Officer Michael Crain, whose funeral was Wednesday.

San Bernardino Sheriff's Deputy Jeremiah MacKay, 35, a 15-year veteran and the father of two children, was killed in Tuesday's shootout at the cabin.

A second San Bernardino County sheriff's officer had to undergo multiple surgeries after he was wounded in the cabin shootout, and other officers also were wounded in earlier alleged encounters with Dorner.

After Crain's death, police tracked Dorner to the Big Bear Lake area of Southern California, where his burning truck was found in the mountains late last week.

A couple with a cabin in the area were some of the last people to see Dorner before his final encounter with police. Their 911 call to police triggered a chase that concluded with the fiery standoff at the nearby cabin.

The couple, Karen and Jim Reynolds, said at a news conference Wednesday that their ordeal lasted a few minutes but seemed like hours.

The Reynolds believe Dorner, 33, was holed up starting Friday in their unoccupied cabin in Big Bear, Calif., only steps from where police had set up a command center.

"He said four or five times that he didn't have a problem with us, he just wanted to clear his name," Jim Reynolds said. "He said, 'I don't have a problem with you, so I'm not going to hurt you.'"

Dorner tied their arms and put pillowcases over their heads before fleeing in their purple Nissan, the couple said.

Before he fled, the couple said Dorner told them that he had been watching them before he took over their cabin. Dorner told the couple he could tell they were "hard working, good people."

"He had been watching us and saw me shoveling the snow Friday," Jim Reynolds said.

They say they may have left the cabin door unlocked and that could have been the reason Dorner was able to enter undetected.

Dorner remained "calm and meticulous" throughout the harrowing ordeal, the couple said.

The Reynolds walked into their cabin around noon Tuesday when they came face-to-face with Dorner. There was no question in their minds who he was -- the suspected cop killer at the center of one of the largest manhunts in recent memory.

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Water wars loom as the US runs dry

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Athletics: Paralympic day to top off London Diamond

LONDON: London's Olympic Stadium will stage three days of athletics in July, including one devoted solely to Paralympic competition, British Athletics has announced.

The London Anniversary Games, which will take place from July 26-28 and in the process mark a year since the opening ceremony of the 2012 Olympics, will incorporate the annual two-day Diamond League meeting on the Friday and Saturday, but also, for the first time, a day of purely Paralympic competition on the Sunday.

Sebastian Coe, who chaired the London 2012 Organising Committee and is now chairman of the British Olympic Association, said it was terrific news.

"I am delighted that the London Anniversary Games has been confirmed as three days of international athletics this July.

"London 2012 was an amazing year for British sport and what a way to celebrate its success by welcoming the world back to London once more to watch the biggest names in athletics."

British middle distance great Coe, the Olympic 1,500 metres gold medallist at both the 1980 and 1984 Games in Moscow and Los Angeles respectively, added he hoped this July's event would build on the success of London 2012.

"It is an important part of the London 2012 legacy that as many people as possible experience world class sport in the world class facilities at Queen Elizabeth Olympic Park and I'm sure the London Anniversary Games will go a long way to inspiring the next generation of track and field fans."

Former Olympic 400m champion Christine Ohuruogu, who grew up in Stratford, added: "The London Diamond League has always been one of my favourite meets so it's fantastic that it's retaining its two day format.

"The atmosphere in the stadium was phenomenal last year and I'll never forget it -- it was very special for me as a local girl."

Officials had already announced the London Diamond League meeting would move to the Olympic venue in the eastern district of Stratford from Crystal Palace in south London.

But on Wednesday they said in addition to the usual track and field meeting on the first two days, the weekend would be topped off by a day of Paralympic competition in the Olympic Stadium, that will come soon after the International Paralympic Committee World Championships in Lyon, eastern France.

Earlier in July, two rock music concerts will see the 80,000-seater Olympic Stadium used for the first time since the Paralympics closing ceremony in September.

Although the Olympic Stadium is due to stage the 2017 World Athletics Championships, doubt remains over its long-term future.

English Premier League football club West Ham have been named as the preferred bidder for the tenancy and a final decision on their bid is expected before April.

The £292 million ($463 million, 348 million euro) complete transformation of the Olympic Park, which began when the London 2012 Games ended, is set to take 18 months.

-AFP/gn

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Sheriff: 'We did not intentionally burn' the cabin

STORY HIGHLIGHTS

• Radio traffic describes use of gas canisters at cabins


• Slain officer's widow thanks mourners: "A lot of people loved Mike"


• Villaraigosa says police have a "reasonable belief" that Dorner died in a mountain standoff


• Authorities have not conclusively identified the body found near Big Bear Lake

Follow the story here and at CNN affiliates KCBS/KCAL, KABC and KTLA. Anderson Cooper 360º devotes the entire hour to the frenzied manhunt, the final shootout, and the people allegedly killed by an ex-LA cop. Watch "9 Days of Terror: The Hunt for Christopher Dorner" Wednesday at 8 p.m. ET on CNN.

Riverside, California (CNN) -- Authorities said Wednesday they are reasonably sure that the body found inside the burned cabin near Big Bear Lake, California, is that of Christopher Dorner, the rogue ex-cop who allegedly had been pursuing a vendetta against his fellow officers.

"We believe that this investigation is over, at this point, and we'll just need to move on from here," San Bernardino Sheriff John McMahon told reporters.

Although the description and behavior of the man who was killed are consistent with Dorner, officials "cannot absolutely, positively confirm it was him," McMahon said.

"We're not currently involved in a manhunt," he said. "Our coroner's division is trying to confirm the identity through forensics."

Authorities say Dorner launched a guerrilla war against the Los Angeles Police Department over what he considered his unfair dismissal in 2009.

McMahon identified a sheriff's detective who was fatally shot Tuesday by the man presumed to have been Dorner as Jeremiah MacKay. MacKay, 35, was a 15-year veteran and married with two children, a 7-year-old daughter and a 4-month-old son.

Another officer has undergone "a couple of different surgeries" after being wounded in the shootout. "He's in good spirits and should make a full recovery after a number of additional surgeries," McMahon said.

The two men were ambushed when they responded to a report of a vehicle stolen by a suspect matching Dorner's description, McMahon said.

"It was like a war zone, and our deputies continued to go into that area and tried to neutralize and stop the threat," McMahon said. "The rounds kept coming, but our deputies didn't give up."

The suspect then fled into a nearby vacant cabin, which caught fire after police shot tear gas canisters into it, McMahon said.

Although the canisters included pyrotechnic tear gas, which generates heat, "We did not intentionally burn down that cabin to get Mr. Dorner out," McMahon said.

It was not clear how long the man believed to have been Dorner had been in the cabin, said San Bernardino County Deputy Chief Steve Kovensky.

Last Thursday, after Dorner's burned-out vehicle was found nearby, "each cabin" in the area had been inspected for signs of break-in or open doors, he said.

"I don't believe that there (was) anybody in there on Thursday, at the start of the investigation," he said. "We did not find any forced entry."

But neighbors have told CNN that no one knocked on their doors.

It wasn't clear when a formal identification could be made of the charred remains found in the cabin about 100 miles east of Los Angeles after Tuesday's shootout with police. Until then, "a lot of apprehension" remains in the ranks of the LAPD, Lt. Andy Neiman said.

"It's been a very trying time over the last couple of weeks for all of those involved and all those families, friends and everybody that has been touched by this incident," he said.

On Wednesday, police from around the Los Angeles area and beyond gathered to bury Michael Crain, who was fatally shot by the 33-year-old former Navy officer.

Dorner is also accused of killing the daughter of a former LAPD captain and her fiance and of shooting three other cops, including Crain's partner.

A squad of bagpipers led Crain's flag-draped casket through a cordon of blue uniforms into a church in Riverside, the Los Angeles suburb where he served 11 years on the force.

The mourners who packed the church included California Gov. Jerry Brown, his Highway Patrol chief and law enforcement from a number of other agencies around the region.

"I knew that communities would reach out, and I knew a lot of people loved Mike," Regina Crain, the slain officer's widow, told them. "And I knew that I would have support no matter what. But I really did not realize the sheer scale of this, and how many people are touched by his life. It gives me really great comfort to see that, and I want to thank you all."

'A very trying time' for the LAPD

Timeline in manhunt

Investigators began scouring the mountains last Thursday, when investigators found Dorner's scorched pickup. Police, sheriff's deputies and federal agents swarmed into the area, working through a weekend blizzard, but the trail was cold for days.

On Sunday, the San Bernardino County Sheriff's Department said it had scaled back the search. Villaraigosa announced a $1 million reward for information leading to Dorner's arrest and conviction, spurring hundreds of tips.

Then, early Tuesday afternoon, California Fish and Wildlife wardens said they had spotted a man who appeared to be Dorner driving a purple Nissan down icy roads near Big Bear Lake.

'Here comes this guy with a big gun'

The wardens, driving in two different vehicles, chased Dorner, and a gun battle ensued. One of the warden's cars was hit, and Dorner crashed his car and ran, according to authorities. He then carjacked a pickup truck.

Rick Heltebrake, a camp ranger, said he was driving when he saw the crashed purple vehicle -- and then something terrifying.

How authorities identify a burned body

"Here comes this guy with a big gun, and I knew who it was right away," Heltebrake told CNN affiliate KTLA. "He just came out of the snow at me with his gun at my head. He said, 'I don't want to hurt you. Just get out of the car and start walking.' "

Heltebrake said the man let him take his dog and walk away with his hands up.

"Not more than 10 seconds later, I heard a loud round of gunfire," Heltebrake said. "Ten to 20 rounds, maybe. I found out later what that was all about."

Dorner fled to a nearby cabin and got into another shootout, this time with the San Bernardino County deputies, killing one and wounded another.

Some of the firefight between police and the suspect was captured live on the telephone of a reporter for CNN affiliates KCBS and KCAL. Police in Los Angeles listened live over police scanners broadcast on the Internet, Neiman said.

"It was horrifying to listen to that firefight," he said. "To hear those words, 'officer down,' is the most gut-wrenching experience you can have as a police officer, because you know what that means."

'Maintain your discipline'

A law enforcement source told CNN the cabin caught fire when police tossed smoke devices inside. The cabin was fully ablaze within minutes and burned for hours as authorities waited at a distance.

Devices such as "flash-bang" grenades and tear gas canisters designed to disorient and disable suspects can cause fires, CNN contributor Tom Fuentes, a former FBI assistant director, said Wednesday. But it wasn't clear exactly how the fire started.

Audio from a Los Angeles television station captured the sound of someone early in the standoff shouting, "Burn it down ... burn that goddamn house down. Burn it down." It's not clear who used those words.

But the order to use smoke canisters -- "burners" -- didn't come for another two hours, according to San Bernardino County sheriff's radio traffic.

"Seven burners deployed, and we have a fire," one officer reported at 4:16 p.m. (7:16 p.m. ET).

Five minutes later, a single gunshot was reported from inside the house. A senior officer ordered units around the cabin, "Stand by. Maintain your discipline." About a minute after that, officers reported ammunition exploding inside.

After initially saying that no body had been found, sheriff's investigators confirmed overnight that they had found charred human remains among the ashes.

Dorner cheered in some quarters

Dorner had vowed to kill police officers to avenge what he called his unfair termination. He was fired after accusing his training officer of kicking a suspect during a July 2007 arrest -- a complaint the LAPD concluded was unfounded.

Talk Back: Does the Dorner case teach us anything about guns?

The department accused him of lying to superiors and to internal affairs investigators and forced him out in January 2009. Dorner challenged his dismissal in court but was unsuccessful.

Dorner was first named a suspect in two shooting deaths on February 3: Monica Quan, the daughter of his police union representative, and her fiance, Keith Lawrence.

Police say he killed Crain and wounded Crain's partner in an ambush on their patrol car Thursday. They say he also wounded an LAPD officer who chased him in the suburban city of Corona, California.

In a manifesto explaining his rampage, Dorner said nothing had changed in the LAPD since its scandals of the 1990s, the Rodney King beating and the Rampart police corruption case. Those allegations have struck a chord with some who say that, despite the four killings, Dorner was seeking justice.

Shadowed by that history, LAPD Chief Charlie Beck announced Saturday that the department would re-examine its proceedings against Dorner. The review is "not to appease a murderer," but "to reassure the public that their police department is transparent and fair in all things we do," he said.

CNN's Miguel Marquez, Paul Vercammen, Stan Wilson, Casey Wian, Kathleen Johnston, Alan Duke, Lateef Mungin, Chelsea J. Carter, Michael Martinez, Holly Yan and Michael Pearson contributed to this report.

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Source: American, US Airways merger approved

Updated 8:13 PM ET

(MoneyWatch) A source told CBS News that the boards of American Airlines and US Airways (LCC) have approved a merger that would create the world's biggest carrier.

Under the deal, which is expected to be unveiled Thursday if the timeline isn't moved up sooner and there are no last-minute snags, the combined airline would keep the "American" name. It would still require federal approval, although that is virtually ensured. US Air CEO Doug Parker is expected to lead the combined company.

A merger of US Air and American would surpass a 2010 tie-up between United Airlines (UAL) and Continental and a 2008 deal joining Delta (DAL) and Northwest. The merged American would be the largest carrier and sport a market valuation of roughly $10 billion.

Although airlines tout such consolidation as a way to cut costs and expand service amid intense competition, whether industry mergers raise fares is an open question. Many analysts say yes because reduced competition in any business often results in higher prices. One study found that ticket prices went up more than 20 percent between Detroit and Atlanta after Delta bought Northwest. Fares went up more than 30 percent on routes between Chicago and Houston, as well as Newark to San Francisco, after the United-Continental deal.

In seeking to run more efficiently, merging airlines also often cut capacity and eliminate routes. 

Play Video

American close to merger with U.S. Airways

Other analysts are more optimistic about the potential benefits to travelers. They say the three largest U.S. airlines still must compete with discount carriers such as Southwest (LUV), which has flourished for years by offering low-cost flights and no-frills service.

The consolidation trend is largely blamed on the price of fuel. Oil now costs so much more per barrel than it did 10 years ago that one analyst says the margin of profit on many flights has shrunk to the value of a single seat. That means an airline can lose money if it flies with one single empty middle seat. The days of elbow room are over.

American Airlines has been operating under court supervision since declaring bankruptcy in November 2011.

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Ship Stranded: Love Boat to Horror Honeymoon

A Texas couple's fantasy wedding quickly turned into a nightmare honeymoon when the fire-damaged Carnival Cruise ship carrying them became stranded in the Gulf of Mexico.

Rob Mowlam, 37, and Stephanie Stevenson, 27, of Nederland, Texas, got married on the Carnival Triumph on Saturday. The four-day cruise was meant to be back to shore on Monday, but was left disabled by an engine fire on Sunday.

The ship is being slowly towed to shore and is expected to dock in Mobile, Ala., on Thursday if weather permits. The vessel is without air conditioning, many working toilets and some restaurant service. Passengers, many who are sleeping in tents on deck, have told ABC News the smell on the ship is foul.

That is the honeymoon setting for Mowlam and Stevenson.

"[Rob Mowlam] had been with his girlfriend, or fiance, for a long period of time and they just took the next step," Mowlam's brother James Mowlam III told ABCNews.com. "The captain is the king of the world when they're on the boat and he hitched them up."

James Mowlam said he was shocked when he heard about the stranded boat and the increasingly dire conditions on the ship.

"It is an atrocious scene to be subjected to," he said.

Mowlam said he has not been able to communicate with his brother, but that his father has had sporadic communication with him.

"It would be my guess that this would probably not be on anyone's great list of memorable wedding experiences," Mowlam said with a laugh. "Although, my mom told him that she was hoping they had a memorable wedding and I think this would classify as a memorable wedding experience."

Lt. Cmdr. Paul McConnell/U.S. Coast Guard/AP Photo

Carnival Cruise Ship Making Its Way to Port Watch Video

Carnival Cruise Ship Stranded for Third Day Watch Video

Carnival Cruise Ship Stranded off Yucatan Peninsula Watch Video

The bride's brother, Justin Davis, told ABCNews.com that his sister works for a doctor's office and the cruise was a gift from the doctor to the staff.

Davis has not been able to speak to Stevenson but said that her two young sons are being cared for by her mother. He said his sister is tough and he guesses she's probably not scared.

"She might be a little aggravated at the situation, but I'd say she's [probably] handling it really well," he said.

Others on the ship do not seem to be handling the situation so well.

Elderly and disabled passengers aboard the ship are struggling to cope with the worsening conditions, according to at least one passenger.

"Elderly and handicap are struggling, the smell is gross," passenger Ann Barlow text-messaged ABC News overnight. "Our room is leaking sewage."

The head of Carnival Cruise Lines said the British-U.S.-owned company was working hard to ensure the thousands of passengers stranded on the disabled ship were as comfortable as possible while the vessel was being towed to a port in Alabama.

"I need to apologize to our guests and to our families that have been affected by a very difficult situation," Carnival Cruise Lines president and CEO Gerry Cahill said at a news conference Tuesday evening.

It was the first time since a fire erupted in Triumph's engine room Sunday, knocking out its four engines, that a company representative had spoken publicly. The Triumph, with roughly 4,200 people on board, was left bobbing like a 100,000-ton cork for more than 24 hours. Giant sea-faring tugboats then hooked up to the ship and began towing the nearly 900-foot-long ship to land.

Carnival spokeswoman Joyce Oliva told The Associated Press Tuesday that a passenger with a pre-existing medical condition was taken off the ship as a precaution. Everyone else will likely have to weather conditions such as scarce running water, no air conditioning and long lines for food.

Back on land, passenger Barlow's 11-year-old twins told ABC News Tuesday they are worried as more passengers continue to talk about living with limited power and sanitation.

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Plants listen more closely to kin than strangers

It is not just humans that like a natter with their nearest and dearest – plants pay most attention to their closest relatives.

When an insect bites a leaf, many plants release volatile chemicals to prime their neighbours for attack. The defences this triggers vary – some plants respond by attracting predatory insects that eat the herbivores, others make themselves less tasty.

Now Richard Karban of the University of California, Davis, has shown that for the sagebrush, responses to these warning signals can vary with relatedness.

At the start of three growing seasons, Karban's team exposed different branches of the same plants to volatile chemicals. The substances came from relatives of the same species whose leaves had been clipped to trigger chemical release.

By the end of the seasons, herbivores had done less damage to the branches exposed to chemicals from close relatives than to those receiving signals from more distant relatives – the warning probably prompting the plants to release herbivore-deterring chemicals, says Karban.

He has previously shown that the blend of volatiles varies enormously between individuals – "so much so that big peaks in some individuals are undetectable in others", he says.

However, there is some similarity between family members. Karban thinks this variability is being exploited by the plants as a kind of family-specific signature, to prevent eavesdroppers from listening in and to give those that share the same genes a greater chance of survival.

Some plants are genetically more resistant to being eaten than others, so it makes sense that plants should care more about their kin's fate than that of the general population.

"It is very elegant work," says Susan Dudley from McMaster University in Ontario, Canada, who has shown that plants competing for space in a small pot are less aggressive if they are related to their neighbours.

She thinks this kind of kin-recognition is probably common among many plants.

Journal Reference: Proceedings of the Royal Society B, doi: 10.1098/rspb.2012.3062

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