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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President Tan confident US will steer world out of uncertainty

SINGAPORE: President Tony Tan Keng Yam has said he is confident that the United States will be able to rise to the occasion of steering of the world out of economic uncertainty, under the leadership of President Barack Obama.

In a congratulatory letter to President Obama on his inauguration for a second term in office, President Tan noted that during his first term, the US averted a financial and economic catastrophe while the lives of many Americans improved.

President Tan said the global economic outlook remains subdued and many countries will continue to look to the US for leadership.

He said he is confident that under President Obama's leadership, as well as the resourcefulness and tenacity of the American spirit, the US will be able to rise to the occasion.

Turning to relations between Singapore and the US, President Tan said both sides enjoy excellent and multifaceted relations underpinned by the US-Singapore Free Trade Agreement and the Strategic Framework Agreement.

Over the last four years, cooperation between both countries has broadened to include education and technical assistance to developing countries, particularly within the Association of Southeast Asian Nations.

President Tan said he looks forward to further enhancing the bilateral relationship.

He also wished President Obama every success during his second term in office.

- CNA/al

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Tale of two terms: Unfinished battles

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STORY HIGHLIGHTS

• At the start of his second term, Barack Obama has major issues left undone from his first


• Deficits, Social Security and Medicare are carrying over into his second-term agenda.


• Education. Science and technology advances also are issues that may shape next four years

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) -- What a difference.

Barack Obama assumed the presidency four years ago on a day full of history and hope. The second time around there is less hype, far lower expectations, and no illusions about the capital's political climate.

"I just want things to work," then President-elect Obama told CNN in an interview days before taking office in 2009.

To revisit that conversation is to be reminded that on many of the big issues on the original Obama agenda, Washington did anything but work -- or at least work together.

His signature first-term achievement -- health care reform -- was accomplished despite near unanimous Republican opposition. Many other priorities he listed just before taking the oath of office four years ago are still waiting for serious attention - or progress -- as he begins term two.

Obama 2.0: Smarter, tougher -- but wiser?

"The deficit levels I'm inheriting -- over $1 trillion coming out of last year -- that is unsustainable," the president-elect said in his final interview before the 2009 inauguration. Yet deficits in each of his first four years topped $1 trillion.

More of his first inaugural wish list: "Let's get a handle on Social Security. Let's get a handle on Medicare."

Deficits, Social Security and Medicare are now carrying over to the second-term agenda. So does immigration. New to the list is a promise to push an assault weapons ban and other gun controls.

What do all of these have in common? They are issues ripe for confrontations with Republicans, especially at a time the GOP's conservative base is determined to reassert itself.

Yet that wish list also puts the president at odds, to varying degrees, with members of his own party. Liberals, for example, vow to resist any major Medicare changes. Centrist and conservative Democrats, especially those with tough re-election prospects in 2014, are hardly rushing to embrace new gun controls.

Not to mention a varied and unpredictable portfolio of international challenges -- from a volatile Middle East to evolving economic and security challenges in an Asia increasingly defined by China.

And then there is this: the ticking clock of any president's second term. How long will it take before the lame duck debate begins in earnest? "They won't have more than a year, 18 months tops," said the veteran Republican strategist Mary Matalin, who in addition to her deep campaign experience served as a top adviser to President George W. Bush and his vice president, Dick Cheney.

Her own experience in the second Bush-Cheney term shapes her early take on the political climate as Obama begins his fifth year in office: "With the six-year itch midterm and a 2016 open primary looming, it will be all positioning all the time."

As in the first four years, the strength of the American economy will determine more than anything else how much room the president has to advance his top priorities.

A unified voice rises from a divided place: Mr. President, please fix America

Education. Science and technology advances. Critical infrastructure investments. Top Obama adviser David Axelrod lists those as first-term priorities that, in his view, not only carry over to the next four but will shape whether the second Obama term is a success.

"How do we position the American economy for the 21st Century?" is Axelrod's one sentence take on the president's second-term challenge.

Obama's preparations included a recent session with presidential historians to discuss not only the climate he faces, but the historical differences for past presidents given the opportunity to serve a second term.

President Obama is the fourth of the last five presidents to get a second term. The others - Ronald Reagan, Bill Clinton and George W. Bush - all had major events that undermined their political standing.

For Reagan it was Iran-Contra. Clinton had the gift of a booming economy, but any thought of making progress on major generational challenges, like Medicare and Social Security, were sidetracked by the Monica Lewsinsky scandal and the impeachment saga.

Bush began his second term with opposition to the Iraq war on the rise, and was further damaged by the deeply held view that his administration failed to properly respond to Hurricane Katrina.

To Matalin, a fierce Republican critic, a major early second-term challenge for Obama will be to change what she sees as a political reflex that has undermined his ability to work with GOP leaders in Congress.

"Second terms exacerbate both strengths and weaknesses," she said. "If you are humility challenged, self-reverential and self-righteous like Obama, you get even more hubris and demonize rather than debate your opponents."

Obama aides bristle at suggestions he is responsible for the trust deficit with the GOP; they say Republicans made a decision very early on in the first term to oppose virtually every Obama initiative. In their view, the burden is on the GOP in term two to show a more cooperative tone and mindset.

Matalin also raised an operational challenge for second-term presidents: high turnover in senior positions, from the White House staff to key Cabinet positions.

"Anyone who hasn't left is exhausted," she said. "Anyone who is new is not top drawer."

Obama to strike 'hopeful' tone in inaugural address

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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

President Obama's 2nd Inauguration: Hundreds of Thousands to Attend 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

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WP will strengthen the voice of the opposition: Lee Li Lian

SINGAPORE: Workers' Party (WP) candidate for the Punggol East by-election, Lee Li Lian said having another WP member in Parliament will strengthen the voice of the opposition.

It means more airtime for the opposition to ask more questions on behalf of Singaporeans and this, she said will definitely make a difference.

Ms Lee refuted talk that having the WP members in Parliament did not make a difference, saying they have done an excellent job.

She was speaking to reporters after a morning walkabout at Rivervale Plaza.

- CNA/ck

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