3 Americans killed in Algeria

STORY HIGHLIGHTS

• NEW: 7 Japanese are confirmed dead, 3 are unaccounted for, a Japanese minister says


• NEW: An Algerian official says the gas plant will reopen and foreign workers will return


• In addition to 37 confirmed dead, 5 hostages are unaccounted for, Algeria's leader says


• The militants, who were of eight nationalities, came from northern Mali

(CNN) -- At least 37 hostages died in the terrorist seizure of a natural gas facility in eastern Algeria and the subsequent special forces assaults on it, the country's prime minister said Monday.

Five other hostages are missing from the In Amenas complex and could be dead, Prime Minister Abdul Malek Sallal said.

Before Sallal's statement, officials from other countries and companies that employed foreign workers at the sprawling plant had confirmed 29 hostage deaths.

Seven of the 37 confirmed dead haven't been identified yet, according to the prime minister. Those who have been identified include seven Japanese, six Filipinos, three Americans, three Britons and one Algerian, officials from those countries said.

Some 29 militants also died, while three were captured, Sallal said, according to the state-run Algerian Press Service.

The standoff ended Saturday, after four days, when Algerian special forces stormed the complex for the second time. The government said it did so because the militants were planning to blow up the installation and flee to neighboring Mali with hostages.

"If it exploded, it could have killed and destroyed anything within 5 kilometers or further," Sallal said.

Read more: Bloody Algeria hostage crisis ends after 'final' assault, officials say

Militant says Mali unrest spurred assault; others say it followed ample planning

The crisis began Wednesday when Islamist extremists in pickup trucks struck the natural gas complex some 50 kilometers (30 miles) west of the Libyan border, gathered the Westerners who worked there into a group and tied them up.

After taking over, the well-armed militants planted explosives throughout the complex, Sallal said. They came from eight countries: Algeria, Tunisia, Egypt, Mali, Niger, Canada and Mauritania.

Algeria's military talked with the militants, but their demands that prisoners in the North African nation be released were deemed unreasonable, according to the prime minister. The country's special forces waged the assaults to free the hostages and were backed by the Algerian Air Force.

Read more: Nations scramble to account for missing after Algeria hostage crisis

At one point, the militants tried to flee the compound in vehicles that carried explosives and three or four hostages as human shields, Sallal said. At least two of the vehicles flipped and exploded during the attempt, he said.

Sallal said the terrorists had entered the country from northern Mali, where Malian and French authorities are battling Islamist rebels.

One-eyed veteran Islamist fighter Moktar Belmoktar has claimed responsibility for the hostage-taking on behalf of his al Qaeda-linked group, according to Mauritania's Sahara Media news agency.

Belmokhtar said the attack was in retaliation for Algeria allowing France to use its airspace to battle Islamist militants in Mali. But regional analysts believe the operation was too sophisticated to have been planned so quickly, and Sallal said the hostage scheme had been hatched over months.

Algerian minister says gas plant will restart, foreign workers will return

The targeted gas facility is run by Algeria's state oil company, in cooperation with foreign firms such as Norway's Statoil and Britain's BP. Some 790 people worked there, including 134 foreign workers, Algeria's prime minister said.

Read more: Algerian forces seek 'peaceful' settlement of dramatic, deadly hostage crisis

British Prime Minister David Cameron said Monday the effort to evacuate workers is complete and that U.K. officials are now focused on bringing the bodies of slain British hostages back home.

Cameron praised Algerian forces for their work in ending the crisis, despite concerns from some nations earlier that the Algerians had unnecessarily put hostages at greater risk.

"This would have been a most-demanding task for security forces anywhere in the world, and we should acknowledge the resolve shown by the Algerians in undertaking it," the British leader said. "The responsibility for these deaths lies squarely with the terrorists."

Such Islamist militant activity is not new to Africa, including recent violence in Mali and Somalia.

Algeria's status as Africa's largest natural gas producer and a major supplier of the product to Europe heightens its importance to those who want to invest there. That interest is coupled with pressure to make sure foreign nationals, and their business ventures, are safe.

Energy and Mining Minister Youcef Yousfi, who a day earlier insisted Algeria can keep its gas facilities secure without foreign forces' help, said he believes the targeted gas facility will be back running "in the shortest possible time" and that foreign workers will soon return. Several foreign companies, including Statoil and BP, evacuated their workers from Algeria after the incident.

"I don't think that these workers have left definitively Algeria," Yousfi told reporters, according to the Algerian Press Service. "Maybe some left ... to reassure their families, but I want to ensure that no company or no worker permanently left the country."

Nations mourn dead, try to account for others

Here is a breakdown on the status of hostages from around the world who were involved in the crisis:

Colombia

Colombia's president said one of its citizens is presumed dead.

France

No known French hostages are unaccounted for, the defense ministry said.

A man identified as Yann Desjeux died after telling French newspaper Sud Ouest that he and 34 other hostages were treated well. It was unclear what led to his death.

Japan

Japanese Vice Foreign Minister Minoru Kiuchi and officials from JGC, a Yokohama-based engineering firm, saw and identified the bodies of seven Japanese citizens killed in the crisis, Chief Cabinet Secretary Yoshihide Suga announced late Monday.

Three Japanese remain unaccounted for, according to Suga.

Malaysia

Three hostages were on their way back home, state media reported. There is a "worrying possibility" that another is dead while a fifth is unaccounted for, the agency said.

Read more: Algeria attack may have link to Libya camps

Norway

Five Norwegians are missing, while eight are safe, according to Norwegian Prime Minister Jens Stoltenberg.

Philippines

Six Filipinos are confirmed dead and four are missing, the nation's foreign affairs ministry said. In addition, 16 Filipinos are alive and accounted for, according to a ministry spokesman.

Romania

One Romanian lost his life while four others were freed, the country's foreign ministry said.

United Kingdom

Three British citizens were killed, the Foreign Office said Sunday. Three other British nationals and a UK resident are also "believed dead," according to British officials. The Foreign Office confirmed the name of one slain hostage, Garry Barlow, in a statement Monday.

"Garry was a loving, devoted family man, he loved life and lived it to the full. He was very much loved by myself, his sons, mother and sister and the rest of his family and friends and will be greatly missed," the Foreign Office quoted his wife, Lorraine, as saying.

Twenty-two other Britons who were taken hostage have safely returned home.

United States

U.S. State Department spokesman Victoria Nuland on Monday said three Americans had been killed and identified them as Victor Lynn Lovelady, Gordon Lee Rowan, and Frederick Buttaccio, who had been previously identified.

Seven U.S. citizens survived the crisis, added Nuland, who declined to comment further citing privacy considerations.

Read more: Algeria attack may have link to Libya camps

CNN's Yoko Wakatsuki and Greg Botelho contributed to this report.

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Anticipating Obama's coming immigration push

(CBS News) MESA, Arizona - In his inaugural address Monday, President Obama touched only briefly on immigration reform. But in the next few weeks, he is expected to propose changes that would put millions of illegal immigrants on the path toward U.S. citizenship.

It could be one of the biggest challenges in his second term.

"We need this president to push as hard as he can, because Latinos care about immigration and the election showed it," said Erika Andiola, a well-known immigrant rights activist in Arizona. "Our families can no longer be separated."

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She crossed the border illegally from Mexico with her mother when she was 11 years old. She was asked what she would say to people who point out she entered illegally.

"Give us a chance to be in the country -- to give back to the country. I think a lot of us have a lot to contribute," Andiola said.

President Obama's deferred deportation program allows those who came illegally as children to work or study in the U.S.

"It would definitely be a dream come true if I was to become a citizen," Andiola said.

Erika Andiola, right, and her mother

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CBS News

She recently lived every illegal immigrant's nightmare. Federal agents took her mother and brother from their home to be deported. Andiola jumped into activist mode. She posted a YouTube video about her experience.

Word went out on Twitter and Facebook.

"Just one organization was able to get 18,000 petitions in a matter of 12 hours.," Andiola said.

She even got members of Congress to call immigration authorities. Her brother and mother were released within 20 hours. Yet, Andiola points out, a record number of undocumented immigrants - almost 410,000 - were deported last year.

"This is why we need immigration reform," Andiola said. "I think it has to happen."

Hispanic political power helped release her mother -- helped elect a president -- and she's convinced it will forge a path to citizenship for millions like her and her mother.

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Obama's 2nd Term: Whose Time Is 'Our Time'?

Jan 21, 2013 12:50pm

Jewel Samad/AFP/Getty Images

ANALYSIS By RICK KLEIN

President Obama used a brief pause in the partisan warfare that’s scarred his time in office to return to the ideals of the Declaration of Independence, with his own declaration of urgency and a call to action that reflects shared sacrifice and responsibility.

This was no centrist conciliator. It was the speech of a committed, unapologetic progressive, an Obama doctrine for domestic policy that included concrete commitments in areas he made little progress on over his first four years. Above all, he was speaking to a changing America – the nation that propelled him to a second term, and whose voices he will need to channel to be effective over the next four years.

“My fellow Americans, we are made for this moment, and we will seize it – so long as we seize it together,” the president declared.

That word “together” appeared seven times in the president’s speech. He used the phrase, “we, the people” five times. Notably, the president said “our time” five times. It was a clear signal that Obama is not satisfied with the frustrations that marked his first term, and that he is cognizant of his opportunity at this moment.

And he sees those opportunities mainly to his left. Obama made a firm commitment to pursue climate-change legislation, in addition to immigration reform and gun control. In an era of budget-cutting, he delivered a rousing endorsement of the social safety net, including Medicare and Social Security.

Obama cited the civil-rights movement and listed Stonewall – the 1960s demonstrations over a police raid of a New York City gay bar that galvanized the gay-rights movement – alongside Seneca Falls and Selma. He also promised equality for “our gay brothers and sisters,” apparently becoming the first president to use the word “gay” in an inaugural address.

Obama’s defining challenge as president has been to deliver on the hope and promise he rode into office on in 2008. He may never hope to fulfill the expectations that surrounded his elevation. But speaking to the largest crowd he’s likely to ever appear before again, the president sounded both more optimistic and more committed to progress on his priorities than anything in our current political system would suggest is warranted.

“Progress does not compel us to settle centuries-long debates about the role of government for all time, but it does require us to act in our time,” the president said.

For a president whose very inauguration speaks to the promise of America, but whose first term ended with so much frustration, it was a return to his roots. President Obama is cognizant of his role in history, though clearly not content with leaving it at that.

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Quadruple DNA helix discovered in human cells

Sixty years after James Watson and Francis Crick established that DNA forms a double helix, a quadruple-stranded DNA helix has turned up.

Quadruple helices that intertwine four, rather than two, DNA strands had been made in the laboratory, but were regarded as curiosities as there was no evidence that they existed in nature. Now, they have been identified in a range of human cancer cells.

The four-stranded packages of DNA, dubbed G-quadruplexes, are formed by the interaction of four guanine bases that together form a square. They appear to be transitory structures, and were most abundant when cells were poised to divide. They appeared in the core of chromosomes and also in telomeres, the caps on the tips of chromosomes that protect them from damage.

Because cancer cells divide so rapidly, and often have defects in their telomeres, the quadruple helix might be a feature unique to cancer cells. If so, any treatments that target them will not harm healthy cells.

"I hope our discovery challenges the dogma that we really understand DNA structure because Watson and Crick solved it in 1953," says Shankar Balasubramanian of the University of Cambridge, UK.

Tagged with antibodies

Balasubramanian's team identified the four-stranded structures in cancer cells with the help of an antibody that attaches exclusively to G-quadruplexes. To stop them from unravelling into the ordinary DNA, they exposed the cells to pyridostatin, a molecule that traps quadruple helices wherever they form.

This enabled the researchers to count how many formed at each stage of cell multiplication. The G-quadruplexes were most abundant in the "S-phase" – when cells replicate their DNA just prior to dividing.

"I expect they will also exist in normal cells, but I predict that there will be differences with cancer cells," says Balasubramanian. His hunch is that the G-quadruplexes are triggered into action by chaotic genomic mutations and reorganisations typical of cancerous or precancerous cells.

"This research further highlights the potential for exploiting these unusual DNA structures to beat cancer, and the next part of this is to figure out how to target them in tumour cells," says Julie Sharp of Cancer Research UK, which funded the research.

Another important question that Balasubramanian's and other teams will try to answer is whether G-quadruplexes play a role in embryo development, and whether such a role is mistakenly reactivated in cancer cells. "We plan to find out whether the quaduplexes are a natural nuisance, or there by design," he says.

Journal reference: Nature Chemistry, DOI: 10.1038/NCHEM.1548

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SDA's Lim to launch online rally at 6pm

SINGAPORE: The Singapore Democratic Alliance's (SDA's) candidate for Punggol East, Mr Desmond Lim, will start his online rally at 6pm on Monday.

Mr Lim told reporters after meeting residents at Kangkar LRT Station in the morning that he will start with two video clips.

Each clip will be between seven and 10 minutes long.

Mr Lim said he will produce at least 10 clips during his by-election campaign.

The videos will be available on his Facebook page and can be downloaded to smartphones.

Mr Lim said his volunteers will approach residents during the walkabouts and ask them if they would like use Bluetooth to transfer the clips to their phones.

- CNA/al

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Obama ends oath with 'so help me God'

By Bill Mears, CNN Supreme Court Producer

updated 6:36 PM EST, Sun January 20, 2013

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STORY HIGHLIGHTS

• Obama used family Bible at Sunday's swearing-in; Will use two others on Monday


• 'So help me God' not required part of presidential oath, but has been said


• Legal challenge fell short before 2009 inauguration

Watch CNN's comprehensive coverage of President Barack Obama's second inauguration this weekend on CNN TV and follow online at CNN.com or via CNN's apps for iPhone, iPad and Android. Then, on Monday, follow our real-time Inauguration Day live blog at cnn.com/conversation. Need other reasons to watch inauguration coverage on CNN's platforms? Click here for our list.

Washington (CNN) -- At his request, President Barack Obama is ending his inaugural oath with: "So help me God."

Those four words are not legally or constitutionally required, unlike other federal oaths that invoke them as standard procedure.

Historians have wrangled over whether George Washington established precedent by adding the phrase on his own during his first Inaugural acceptance, but the Library of Congress website states he did.

Abraham Lincoln was reported to have said it spontaneously in 1861 and other presidents over the years have followed suit.

A Bible is traditionally used in administering the oath.

Opinion: Presidents should not swear in on a Bible

Obama took the official oath on Sunday at the White House with his left hand on the family Bible of his wife, Michelle.

At Monday's ceremonial swearing-in at the Capitol, he will use Bibles from Lincoln and Martin Luther King Jr.

Obama took the oath with the same Lincoln Bible in 2009 when he made history as the first African-American president.

The Constitution lays out the exact language to be used in the oath: "I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States."

Four years ago, a California atheist, Michael Newdow, objected and went to federal court to prevent Supreme Court Chief Justice John Roberts from prompting the president-elect to repeat the "so help me God phrase."

Newdow, along with several non-religious groups, argued the words violate the constitutional ban on government "endorsement" of religion.

The high court ultimately rejected the lawsuit two years ago, and no such legal challenges are expected this time.

Lyndon Johnson's 1965 swearing-in marked a change from tradition.

His wife Claudia, known batter as Lady Bird, held the Bible, a job previously managed by the high court's clerk.

Spouses have since had the honor.

13 reasons to follow the inauguration on CNN's platforms and nowhere else

CNN's Kevin Liptak contributed to this report.

Part of complete coverage on

2013 Presidential Inauguration

Snap a photo of yourself in the crowd and hop onto CNN iReport to tell us why you're there. You can also submit via Instagram by tagging your photo #cnn.

Everything you want to know about the who, what, when, why and how of the nation's 57th Presidential Inauguration ceremony, all organized in our interactive.

All the angles. Interviews and stories galore. Excellent photography. Check out how to follow the best of our coverage, on TV, CNN.com and mobile platforms.

updated 2:06 PM EST, Sun January 20, 2013

An American flag waves at the U.S. Capitol building on Sunday, January 20, as Washington prepares for President Barack Obama's second inauguration. CNN brings you the best images from Washington.

updated 12:38 PM EST, Sat January 19, 2013

President Barack Obama will join what is perhaps America's most exclusive club on Monday.

updated 4:07 PM EST, Sat January 19, 2013

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updated 4:51 PM EST, Fri January 18, 2013

As Inauguration Day approaches, the question on everyone's lips is: What will the first lady be wearing?

Ahead of the inauguration, the nation is is also regrouping. What it does differently this time could indicate what America will emerge.

updated 12:40 PM EST, Sat January 19, 2013

Pulitzer Prize-winning presidential historian Doris Kearns Goodwin notes each inauguration is moving in its own way, but only a few produce moments that are truly memorable.

updated 4:39 PM EST, Fri January 18, 2013

At its essence, the presidential inaugural symbolizes American democracy's peaceful transition or extension of power.

updated 12:43 PM EST, Sat January 19, 2013

From Frank Sinatra to Aretha Franklin, here's a look back at the impact of musical performances at the inauguration.

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It's tempting to dismiss talk of Michelle Obama's wardrobe as frivolous, but her panache for mix-and-match takes it to the next level.

The official retail store for the 57th Inauguration celebrates with special memorabilia for visitors.

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MLK's "content of character" quote inspires debate

"I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character."

This sentence spoken by the Rev. Martin Luther King Jr. has been quoted countless times as expressing one of America's bedrock values, its language almost sounding like a constitutional amendment on equality.

20 Photos

Martin Luther King Jr.

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Martin Luther King III talks his father's legacy

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King, Civil Rights Act remembered

Yet today, 50 years after King shared this vision during his most famous speech, there is considerable disagreement over what it means.

The quote is used to support opposing views on politics, affirmative action and programs intended to help the disadvantaged. Just as the words of the nation's founders are parsed for modern meanings on guns and abortion, so are King's words used in debates over the proper place of race in America.

As we mark the King holiday, what might he ask of us in a time when both the president and a disproportionate number of people in poverty are black? Would King have wanted us to completely ignore race in a "color-blind" society? To consider race as one of many factors about a person? And how do we discern character?

For at least two of King's children, the future envisioned by the father has yet to arrive.

"I don't think we can ignore race," says Martin Luther King III.

"What my father is asking is to create the climate where every American can realize his or her dreams," he says. "Now what does that mean when you have 50 million people living in poverty?"

Bernice King doubts her father would seek to ignore differences.

"When he talked about the beloved community, he talked about everyone bringing their gifts, their talents, their cultural experiences," she says. "We live in a society where we may have differences, of course, but we learn to celebrate these differences."

The meaning of King's monumental quote is more complex today than in 1963 because "the unconscious signals have changed," says the historian Taylor Branch, author of the acclaimed trilogy "America in the King Years."

Fifty years ago, bigotry was widely accepted. Today, Branch says, even though prejudice is widely denounced, many people unconsciously pre-judge others.

"Unfortunately race in American history has been one area in which Americans kid themselves and pretend to be fair-minded when they really are not," says Branch, whose new book is "The King Years: Historic Moments in the Civil Rights Movement."

Branch believes that today, King would ask people of all backgrounds - not just whites - to deepen their patriotism by leaving their comfort zones, reaching across barriers and learning about different people.

"To remember that we all have to stretch ourselves to build the ties that bind a democracy, which really is the source of our strength," Branch says.

Bernice King says her father is asking us "to get to a place - we're obviously not there - but to get to a place where the first thing that we utilize as a measurement is not someone's external designation, but it really is trying to look beyond that into the substance of a person in making certain decisions, to rid ourselves of those kinds of prejudices and biases that we often bring to decisions that we make."

That takes a lot of "psychological work," she says, adding, "He's really challenging us."

For many conservatives, the modern meaning of King's quote is clear: Special consideration for one racial or ethnic group is a violation of the dream.

The quote is like the Declaration of Independence, says Roger Clegg, president of the Center for Equal Opportunity, a conservative think tank that studies race and ethnicity. In years past, he says, America may have needed to grow into the words, but today they must be obeyed to the letter.

"The Declaration of Independence says all men are created equal," Clegg says. "Nobody thinks it doesn't really mean what it says because Thomas Jefferson owned slaves. King gave a brilliant and moving quotation, and I think it says we should not be treating people differently on the basis of skin color."

Many others agree. King's quote has become a staple of conservative belief that "judged by the color of their skin" includes things such as unique appeals to certain voter groups, reserving government contracts for Hispanic-owned businesses, seeking more non-white corporate executives, or admitting black students to college with lower test scores.

In the latest issue of the Weekly Standard magazine, the quote appears in the lead of a book review titled "The Price Was High: Affirmative Action and the Betrayal of a Colorblind Society."

Considering race as a factor in affirmative action keeps the wounds of slavery and Jim Crow "sore and festering. It encourages beneficiaries to rely on ethnicity rather than self-improvement to get ahead," wrote the author, George Leef.

Last week, the RightWingNews.com blog included "The idea that everyone should be judged by the content of their character, not the color of their skin" in a list of "25 People, Places and Things Liberals Love to Hate."

"Conservatives feel they have embraced that quote completely. They are the embodiment of that quote but get no credit for doing it," says the author of the article, John Hawkins. "Liberals like the idea of the quote because it's the most famous thing Martin Luther King said, but they left the principles behind the quote behind a long time ago."

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Sasha's View: 'Good Job, Daddy. You Didn't Mess Up'

President Barack Obama and Vice President Joe Biden today officially embarked on their second term, taking the Constitutionally mandated oath of office in two separate private ceremonies inside their homes.

Shortly before noon in the Blue Room of the White House, Obama raised his right hand, with his left on a family Bible, reciting the oath administrated by Chief Justice John Roberts. He was surrounded by immediate family members, including first lady Michelle Obama and daughters, Malia and Sasha.

As he hugged his wife and daughters, Sasha said, "Good job, Daddy."

"I did it," he said.

"You didn't mess up," she answered.

Biden was sworn in earlier today by Justice Sonia Sotomayor, the first Hispanic to administer a presidential oath, in a ceremony at his official residence at the U.S. Naval Observatory. He was joined by more than 120 guests, including cabinet members, extended family and his wife, Dr. Jill Biden.

Because Jan. 20 -- the official date for a new presidential term -- falls on a Sunday this year, organizers delayed by one day the traditional public inauguration ceremony and parade down Pennsylvania Avenue.

Vice President Joe Biden Sworn in for 2nd Term Watch Video

Obama Sworn In for Second Term, Kicks off Inaugural Festivities Watch Video

Obama and Biden will each repeat the oath on Monday on the west front of the Capitol, surrounded by hundreds of dignitaries and members of Congress. An estimated 800,000 people are expected to gather on the National Mall to witness the moment and inaugural parade to follow.

The dual ceremonies in 2013 means Obama will become the second president in U.S. history to take the presidential oath four times. He was sworn in twice in 2008 out of an abundance of caution after Roberts flubbed the oath of office during the public administration. This year Roberts read from a script.

Franklin Roosevelt was also sworn in four times but, unlike Obama, he was elected four times.

This year will mark the seventh time a president has taken the oath on a Sunday and then again on Monday for ceremonial purposes. Reagan last took the oath on a Sunday in 1985.

Both Obama and Biden took the oath using a special family Bible. Obama used a text that belonged to Michelle Obama's grandmother LaVaughn Delores Robinson. Biden placed his hand on a 120-year-old book with a Celtic cross on the cover that has been passed down through Biden clan.

The official inaugural activities today also included moments of prayer and remembrance that marked the solemnity of the day.

Obama and Biden met at Arlington National Cemetery for a brief morning ceremony to place a wreath on the Tomb of the Unknowns, honoring military service members who served and sacrificed. The men stood shoulder to shoulder, bowing their heads as a bugler played "Taps."

Biden, who is Catholic, began the day with a private family mass at his residence. The president and first family attended church services at Metropolitan African Methodist Episcopal Church, a historically black church and site of two pre-inaugural prayer services for former President Bill Clinton and Vice President Al Gore and their families.

The Obamas and Bidens plan to participate in a church service on Monday morning at St. John's Episcopal, across Lafayette Park from the White House. They will also attend a National Prayer Service on Tuesday at the National Cathedral.

Later on Sunday evening, the newly-inaugurated leaders will attend a candlelight reception at the National Building Museum. The president and vice president are expected to deliver brief remarks to their supporters.

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Earth may be crashing through dark matter walls

Earth is constantly crashing through huge walls of dark matter, and we already have the tools to detect them. That's the conclusion of physicists who say the universe may be filled with a patchwork quilt of force fields created shortly after the big bang.

Observations of how mass clumps in space suggest that about 86 per cent of all matter is invisible dark matter, which interacts with ordinary matter mainly through gravity. The most popular theory is that dark matter is made of weakly interacting massive particles.

WIMPs should also interact with ordinary matter via the weak nuclear force, and their presence should have slight but measurable effects. However, years of searches for WIMPs have been coming up empty.

"So far nothing is found, and I feel like it's time to broaden the scope of our search," says Maxim Pospelov of the University of Victoria in Canada. "What we propose is to look for some other signatures."

Bubbly cosmos

Pospelov and colleagues have been examining a theory that at least some of the universe's dark matter is tied up in structures called domain walls, akin to the boundaries between tightly packed bubbles. The idea is that the hot early universe was full of an exotic force field that varied randomly. As the universe expanded and cooled, the field froze, leaving a patchwork of domains, each with its own distinct value for the field.

Having different fields sit next to each other requires energy to be stored within the domain walls. Mass and energy are interchangeable, so on a large scale a network of domain walls can look like concentrations of mass – that is, like dark matter, says Pospelov.

If the grid of domain walls is packed tightly enough – say, if the width of the domains is several hundred times the distance between Earth and the sun – Earth should pass through a domain wall once every few years. "As a human, you wouldn't feel a thing," says Pospelov. "You will go through the wall without noticing." But magnetometers – devices that, as the name suggests, measure magnetic fields – could detect the walls, say Pospelov and colleagues in a new study. Although the field inside a domain would not affect a magnetometer, the device would sense the change when Earth passes through a domain wall.

Dark matter walls have not been detected yet because anyone using a single magnetometer would find the readings swamped by noise, Pospelov says. "You'd never be able to say if it's because the Earth went through a bizarre magnetic field or if a grad student dropped their iPhone or something," he says.

Network needed

Finding the walls will require a network of at least five detectors spread around the world, Pospelov suggests. Colleagues in Poland and California have already built one magnetometer each and have shown that they are sensitive enough for the scheme to work.

Domain walls wouldn't account for all the dark matter in the universe, but they could explain why finding particles of the stuff has been such a challenge, says Pospelov.

If domain walls are found, the news might come as a relief to physicists still waiting for WIMPs to show up. Earlier this month, for instance, a team working with a detector in Russia that has been running for more than 24 years announced that they have yet to see any sign of these dark matter candidates.

Douglas Finkbeiner of the Harvard-Smithsonian Center for Astrophysics, who was not involved in Pospelov's study, isn't yet convinced that dark matter walls exist. But he is glad that physicists are keeping an open mind about alternatives to WIMPs.

"We've looked for WIMP dark matter in so many ways," he says. "At some point you have to ask, are we totally on the wrong track?"

Journal reference: Physical Review Letters, DOI: 10.1103/PhysRevLett.110.021803

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.

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10 Japanese unaccounted for in Algeria crisis

TOKYO: A Japanese engineering firm said Sunday that 10 Japanese and seven foreign workers remained unaccounted for at an Algerian gas plant that was seized by Islamist militants.

JGC Corp. said it had confirmed the safety of 61 of 78 workers after Algerian troops stormed the remote gas plant Saturday to end the hostage crisis that killed 23 foreigners and Algerians.

"We have newly confirmed the safety of 41 of our workers but the safety of the remaining 10 Japanese and seven foreign workers is yet to be confirmed," JGC spokesman Takeshi Endo told reporters.

- AFP/ck

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