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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Golf: Brian Gay wins Humana Challenge in playoff






LA QUINTA, California: Brian Gay birdied the second hole of a three-man playoff to win the US PGA Tour's $5.6 million Humana Challenge.

Scott Stallings, who took a five-shot lead into the final round, hit his second shot at the par-five 18th into the water and didn't make the playoff that included Gay, Sweden's David Lingmerth and Charles Howell.

The trio finished 72 holes on 25-under 263. US tour rookie Lingmerth had 10 birdies in his 10-under 62 on the Palmer course, where the final round was played after the first three rounds were played over three courses in the southern California desert.

Gay had nine birdies in his nine-under 63, and Howell countered two bogeys with 10 birdies in his eight-under 64 on Sunday.

Gay had a birdie chance at the last which would have given him the outright lead, but missed his eight-footer.

Howell had an 88-foot eagle putt at 18 but three-putted while Lingmerth birdied the last hole of regulation.

All three were in the fairway off the tee at the first playoff hole, the 18th. Gay then found the greenside rough, Howell was on the green and Lingmerth was in the water and couldn't match the pars of the other two.

They headed to the par-four 10th for the second playoff hole. Gay found the fairway and hit his approach to five feet while Howell was in the right rough and from there into a bunker behind the green.

After Howell missed his par attempt, Gay made his birdie putt to claim the fourth US PGA Tour title of his career and his first in four years.

Stallings had five birdies but also three bogeys, his two-under effort giving him a 24-under total of 264. He was tied with James Hahn, who had two eagles in a 62 on another day of ideal scoring conditions.

- AFP/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









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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Obama to take first of two oaths of office Sunday






WASHINGTON: Barack Obama will Sunday be sworn in to shoulder the power and burden of the US presidency for a second term, launching two days of inaugural rituals darkened by domestic discord and crises abroad.

Democrat Obama, 51, will swear to faithfully execute the office of president at a low-key ceremony in the Blue Room of the White House, to comply with the US Constitution, which dictates his first term ends at noon on January 20.

In a tradition honored when that date falls on a Sunday, Obama will repeat the oath in a time-honored public ceremony on Monday, and deliver his inaugural address to Americans, and the watching world, outside at a chilly US Capitol.

Obama's second inauguration, which comes courtesy of an election win over Republican Mitt Romney in November, lacks the hope and history which pulsated through his swearing in as the first black American president in 2009.

Since then, a graying Obama has been battered by a weak economic recovery, failed to meet hugely elevated expectations for his presidency and waged a political war of attrition Republicans, which often slides into the gutter.

He begins anew with several fierce budget battles looming in Congress, and with his "Yes we Can" rhetoric soured by sarcasm over the blocking tactics of Republicans in the partisan brouhaha paralyzing government in Washington.

While polls show Obama's approval ratings above 50 per cent -- far higher than the reviled Congress, they also indicate that many Americans, wearied by a stop-start recovery, doubt their country is headed in the right direction.

Abroad, the US confrontation with Iran is fast headed to a critical point with the specter of military action becoming ever more real, the longer diplomacy over Tehran's nuclear program is stuck in neutral.

Recent terror strikes which killed Americans in Benghazi and Algeria meanwhile call into question Obama's election year soundbite that "Al-Qaeda is on the run" despite the killing of Osama bin Laden in Pakistan.

Increasing muscle flexing by China and rising tensions in contested waters with its neighbors, as well as North Korea's nuclear belligerence, will meanwhile test the president's signature pivot of US diplomacy to Asia.

As he raises his right hand, 224 years after George Washington took the first oath of office to lead a new nation, Obama also knows that for second term presidents, power quickly wanes and political potholes await.

The second term "curse" often strikes: Richard Nixon resigned, Bill Clinton was impeached, George W. Bush's image was shattered by Iraq and Hurricane Katrina and Ronald Reagan's legacy was marred by the Iran-Contra scandal.

Obama has already said that he will root his second term on the crusade to build a more equitable economy which powered his triumph over multi-millionaire Romney.

"I intend to carry out the agenda that I campaigned on, an agenda for new jobs, new opportunity and new security for the middle class," Obama said last week.

After being sworn in surrounded by close family, Obama will put the finishing touches on his inaugural address.

Aides have offered few previews of what he will say on Monday, though such occasions offer the chance for presidents to stress national unity, and to bind wounds of the kind of acrimonious elections like the one Obama won in 2012.

Obama has been seen with yellow legal pads full of ideas for his speech, which will likely be high on poetry but low on policy: his State of the Union Address on February 12 will flesh out his agenda.

But the president will have a message for allies and enemies abroad, and could shape the political ground for top agenda priorities including immigration and energy reform and new gun control laws.

After Monday's solemn ceremony will come celebration, as Obama returns to the White House down a parade route lined with crowds, before a night of glittering inaugural balls -- though the festivities have been trimmed in recognition of the tough times many Americans are still enduring.

On Saturday, Obama and his wife Michelle grabbed paintbrushes for an inaugural day of service at a Washington DC school.

The president, wearing khaki trousers and a button down shirt, and the first lady, in a purple shirt and black leggings, helped stain a bookshelf along with two members of a group that works to keep children in school.

Obama later joked that "Michelle said I did a fine job."

There has been an immense security build-up ahead of the inauguration, with cameras and barricades covering much of the route leading up to the Capitol. Thousands of police will also fan the area on Monday: several at each street corner.

- AFP/ck



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Historic D.C., hidden in plain sight














Locals reveal the D.C. you don't know


Locals reveal the D.C. you don't know


Locals reveal the D.C. you don't know


Locals reveal the D.C. you don't know


Locals reveal the D.C. you don't know


Locals reveal the D.C. you don't know


Locals reveal the D.C. you don't know








STORY HIGHLIGHTS


  • Washington, D.C. holds a lot of nearly hidden history

  • A tennis court occupies the site of the execution of Lincoln assassination conspirators

  • A present-day parking garage once hosted a historic Beatles show




Washington (CNN) -- Ordinarily, I'm not a fan of vandalism.


But years ago I spotted some graffiti in Washington that struck a chord. Someone had spray painted the symbol for anarchy -- a circled "A" -- on a Chinatown grocery store.


And I wondered: Did they know?


Did they know that that building, a century earlier, had been Mary Surratt's boarding house? Did they know that conspirators had gathered there to plot the kidnapping and assassination of an American president? Did they know that the site had played a role in the biggest act of anarchy in this country's history?


Was the graffiti just accidentally appropriate? Or could punks with paint be profound?


I don't know the answer, of course. But I know that this city is teeming with people who, like me, relish its hidden history.


Washington is a town of majestic monuments and memorials. And those are worth visiting. But if you limit your sightseeing to the obvious -- if you ignore the obscure -- you'll miss the good stuff.


That is what I had in mind when I asked historians and history buffs to show me places -- off the beaten path -- that have stirred their love of history and this great town.


WASHINGTON COLISEUM: "I Saw Them Standing There"


Four boys, in dire need of haircuts, come to town, looking to conquer it.


The British tried it once before, in 1814. Burned the city. It left a bad taste in everyone's mouth.


But this time, they try soft diplomacy. A little twist and shout. A little ditty about wanting to hold your hand.


And it works.


Improbable as it sounds, it happened in a barrel-shaped architectural ruin just north of the Capitol on 3rd Street NE.


Shortly after 8:30 p.m. on Feb. 11, 1964 -- two days after appearing on "The Ed Sullivan Show" -- the Beatles took the stage in Washington Coliseum. It was the Beatles' very first stage concert in the United States.


Critics later say the concert is as singular moment in rock history -- a moment when the early Beatles seemed even more joyous than their shrieking teen-age fans.


Richard Layman, who fought to preserve the Coliseum, cherishes this place for many reasons. Built in 1940 and 1941, the building served as an ice rink, sports arena, worship hall, trash transfer station and parking garage. Nation of Islam leaders Malcolm X and Elijah Muhammed spoke here. It hosted numerous professional sports teams, and was home to the Ice Capades.


For Beatle devotees, this is a shrine.


They still have ticket stubs, and remember whether they paid $2, $3 or $4. They gush about how Paul smiled at them.


An age of innocence? Not exactly. The Russians threatened us from outer space. The pains of segregation and integration were rocking the country. And, just three months earlier, an assassin felled the leader of the free world.


But for about 35 minutes on a cold February night in 1964, four boys from Liverpool entered a converted ice rink and warmed a generation's heart.


COURTROOM DRAMA: Last act of the Civil War


The man, a tavern owner, took the witness stand.


"I was acquainted with John Wilkes Booth," he said. "Booth came into my restaurant [adjoining Ford's Theater] on the evening of the 14th of April."


Booth "walked up to the bar, and called for some whiskey, which I gave him; he called for some water, which I also gave him; he placed the money on the counter and went out. I saw him go out of the bar alone, as near as I can judge, from eight to ten minutes before I heard the cry that the President was assassinated."


Peter Taltavul spoke those words, in this room, just one month after Lincoln died.


By then, authorities had already tracked down Booth, cornered him, and killed him. And they had rounded up eight people who they believe had assisted him.


They convened a military commission to conduct the trial in the third floor of what was then a federal penitentiary. The co-conspirators, they reasoned, were not "civilians," but were "enemy belligerents." The nation was seeking justice and vengeance, and it would come swiftly.


On July 6, 1865 -- less than three months after the assassination -- the commission found all eight conspirators guilty. It sentenced four to hang, and four to prison terms. The condemned were hanged the next day.


A year later, the Supreme Court would rule that a defendant could not be tried by military commission when civilian courts were functioning. But it was too late.


The penitentiary is now closed and largely demolished. The land is part of Fort McNair at the southernmost point of Washington.


Visitors -- mostly lawyers and Civil War buffs -- are frequently overwhelmed when they enter the room, said Susan Lemke, a special collections librarian who has accumulated artifacts related to the trial. "There's no substitution for actually witnessing or being in the middle of a historic site like that," she said.


THE GALLOWS: Where generals "serve," conspirators hanged


Michael Kauffman is struck by the incongruity of it all.


On the edge of a Fort McNair tennis court, where generals now casually toss their gym bags, Abraham Lincoln's death was avenged.


Here in this spot, near the penitentiary room where the sentences were handed down, on a miserably hot day in July 1865, Union Army Capt. Christian Rath raised his hands and clapped three times. On the third clap, soldiers knocked supports out from under a gallows, and four prisoners fell. Their bodies jerked violently at the ends of their ropes. The prisoner in the dress appeared to die instantly. But one of her three accused accomplices writhed for five minutes before surrendering his ghost.


"I am one of those people who think that if you really want to understand history, you have to go to where it happened," says Kauffman, an expert on the Lincoln assassination.


So Kauffman leads me to this empty tennis court. It is drizzly and cold, and there is little here to evince the images and emotions of that hot July day. The penitentiary's tall wall has been demolished, and a building prominent in photos of the hanging has been altered almost beyond recognition.


Almost.


Kauffman shows me the place where the wall met the building. And in my mind's eye, the gallows fall into place.


"There's this strange sort of excitement that you get when you've read about something, and you visualize it, and you think you know all about it. And then all of a sudden you go there and it's right in front of you. It surrounds you. And it's always somehow different from what you had imagined," Kauffman said.


Different, to be sure. But more real than ever.


CHADWICKS: Where the U.S. was shaken, and stirred


It is known as "The Big Dump."


On June 16, 1985, CIA officer Aldrich Ames walked into Chadwicks, a Georgetown pub, with two shopping bags full of classified information and, over lunch, gave them to a Soviet diplomat.


"In those bags was every piece of paper he could get his hands on that revealed almost all of our operations in the Soviet Union," said Peter Earnest, a former CIA official who is now executive director of the International Spy Museum in D.C.


Five to seven pounds of secrets.


The enormity of the breach became known only after the Soviet Union began rounding up some of the United States' most valuable assets in Russia. At least 10 were executed.


The CIA launched a hunt for a possible mole. It compiled a list of 190 CIA officers with access to relevant classified information, and culled it to 28. And in 1994 -- nine years after the Big Dump -- Ames and his wife were arrested.


Earnest says he doesn't "romanticize" the Chadwick's site, but says "the repercussions of what he did ripple through the government today -- the need to have more polygraphs, the concerns about our records ... the nature of the questions asked."


It's also a waypoint in the Spy Museum's bus tour, which notes the role that Ames' "high-maintenance" wife Rosario played in his betrayal of his country.


Tour guides note that after Ames was arrested, FBI agents who eavesdropped on their conversations made an astonishing comment: They were so disgusted with Rosario's constant badgering about money, her criticisms of Ames and her treatment of their son that although they could never forgive Ames for spying, they said, they would have understood if he had killed his wife.


ALEXANDRIA SLAVE PEN: From slave to freeman


"PRICE, BIRCH & CO," the sign read. "DEALERS IN SLAVES."


The sign is long gone, but the building, known as the "Alexandria Slave Pen," still stands in Alexandria, Virginia, just across the river from Washington.


"I often tell my students, 'You've gone into towns where you just see row after row of car dealerships. Duke Street was that -- but slave dealerships,'" says Chandra Manning, associate professor of history at Georgetown University.


In 1861, the slave trade was thriving when Virginia seceded from the union. But on May 24 of that year, the Union Army's First Michigan Infantry marched into town, and one of the first things it did was liberate the slaves.


Ironically, the slave pen became a refuge for runaway and freed slaves seeking the protection of the Union Army.


Today, 1315 Duke Street is home to the Alexandria branch of the National Urban League, a civil rights organization. A historical marker stands outside, and there's a small museum in the basement.


But Manning believes most passersby have no idea about the building's horrific past.


Most, but not all.


"If you're walking with me," Manning says, "you have no choice but to know what happened here."


THE FORGOTTEN CRASH: History lost and relived


On a fog-shrouded evening on the penultimate day of 1906, a dead-heading train roared down this stretch of tracks near Washington's Catholic University, coming upon a slower passenger train heading the same direction on the same track. There was no time to stop.


Railroad workers have an antiseptic -- but descriptive -- word for what happened next: Telescoping.


The massive steel engine of the speeding train plowed through the flimsy wooden passenger car of the slower train, killing and dismembering its occupants. It plowed through the next car as well, and the one after that. When the trains came to a stop, cinders and soot from the locomotive's fire box rained down on the splintered wooden planks, clothing, Christmas gifts and human remains. Fifty-three people died, and more than 70 were injured.


Today, the "Terra Cotta" crash is all but lost to history. Every day, thousands pass the site, where there isn't even a hint of the horror that happened.


But Richard Schaffer, a D.C. firefighter who spent 10 years researching the crash, says Terra Cotta nonetheless changed railroading. It hastened the conversion of passenger cars from wood to steel and led to improvements in railroad signaling. That happened, he says, because the crash happened on "the route to Congress."


There's a saying, sometimes attributed to Mark Twain: "History doesn't repeat itself, but it does rhyme."


History rhymed in June 2009 -- nearly 103 years later -- when a D.C. Metro subway train plowed into another subway train. The cars telescoped, killing nine and injuring dozens.


"The irony was it was practically the same location and practically all the same problems, human error, signaling problems, construction quality of the trains," Schaffer said.


Both wrecks deserve to be remembered.


"If you forget what's happened before you," Schaffer says, "you don't have a foundation to live upon."


CONGRESSIONAL CEMETERY: The last hurrah


Can there be any doubt what happens here when the sun goes down?


Can there be any doubt that, when the gates close and the last visitor leaves this historic burial ground, band leader John Philip Sousa reaches for his baton, Civil War photographer Mathew Brady tweaks his camera, and J. Edgar Hoover tries to keep the whole mess under control?


This is Congressional Cemetery, where Washington's political and social establishment rests in eternal peace. In the 1800s, its heyday, this was the site of grand funeral processions. Tens of thousands of Washingtonians would gather to watch soldiers carry fallen leaders down a slate path to graves or crypts.


"I'm sure there are quite a few secrets buried here," says Abby Johnson.


Abby and her husband Ronald, professors of literature and history respectively at Georgetown University, take me to the "Public Vault," a crypt the size of a one-car garage. Built in the 1830s, the vault was used to store the bodies of public officials until the ground thawed, or until they were moved to other locations.


You need a skeleton key, of course, to get inside.


Dolly Madison slept here. As did three presidents: William Henry Harrison (1841), John Quincy Adams (1848), and Zachary Taylor (1850). Harrison's three-month stay was three times longer than his presidential term. All the presidents' bodies have since been moved to their home states.


Today, Congressional Cemetery, which boasts of being "in the shadow" of the U.S. Capitol, is overshadowed by a more prominent cemetery -- Arlington. But the Johnsons are devoted to keeping Congressional's memory alive. At least as long as they are alive. And then maybe, just maybe, beyond.







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Algerian standoff ends; 23 hostages dead

(CBS News) LONDON - Four days after it started, the standoff between Algerian forces and al Qaeda-linked militants in the Sahara Desert is over. Algerian special forces stormed a remote natural gas complex where hundreds of workers had been held captive. Algerian officials say 23 hostages are dead, including one American. About 32 militants are reported to have been killed.

Some of the hostages were able to escape from the gas plant before Algerian special forces launched their final assault.

State media reported that a number of foreign hostages survived, including at least two Americans. But in the chaos, it's not yet possible to get the exact figures.

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U.S. military aircraft evacuated some survivors to a NATO airbase in Sicily.

Pictures of the siege show gunmen rounding up hostages. One BP worker said terrorists told him: "'You have nothing to do with this. You are Algerians and Muslims. We only want the foreigners.'"

BP Chief Executive Bob Dudley said 14 of its 18 foreign employees at the plant were safe.

"We are not able to confirm the circumstances of four of our employees," he said. "Tragically, we gravely feel that we will be seeing fatalities from this group."

Algerian troops discovered a cache of heavy machine guns, rocket launchers, and grenades. Hostages said the explosives were wired around their necks.

Local media have have identified Abdul Rahman al-Nigeri as the leader of the attack. He's a lieutenant of Moktar Belmoktar, head of an al Qaeda-linked group based in North Africa.

The Algerian state oil company running the plant said the attackers had the entire refinery booby-trapped and that it would be days before the clearing-out process is complete.

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Algeria Hostage Crisis Over, One American Dead













After the Algerian military's final assault on terrorists holding hostages at a gas complex, the four-day hostage crisis is over, but apparently with additional loss of life among the foreign hostages.


One American, Fred Buttaccio of Texas, has been confirmed dead by the U.S. State Department. Two more U.S. hostages remain unaccounted for, with growing concern among U.S. officials that they did not survive.


But another American, Mark Cobb of Corpus Christi, Texas is now confirmed as safe. Sources close to his family say Cobb, who is a senior manager of the facility, is safe and reportedly sent a text message " I'm alive."










Inside Algerian Hostage Crisis, One American Dead Watch Video









American Hostages Escape From Algeria Terrorists Watch Video





In a statement, President Obama said, "Today, the thoughts and prayers of the American people are with the families of all those who were killed and injured in the terrorist attack in Algeria. The blame for this tragedy rests with the terrorists who carried it out, and the United States condemns their actions in the strongest possible terms. ... This attack is another reminder of the threat posed by al Qaeda and other violent extremist groups in North Africa."


According to Algerian state media, 32 militants are dead and a total of 23 hostages perished during the four-day siege of the In Amenas facility in the Sahara. The Algerian Interior Ministry also says 107 foreign nationals who worked at the facility for BP and other firms were rescued or escaped from the al Qaeda-linked terrorists who took over the BP joint venture facility on Wednesday.


The Japanese government says it fears "very grave" news, with multiple casualties among the 10 Japanese citizens working at the In Amenas gas plant.


Five British nationals and one U.K. resident are either deceased or unaccounted for in the country, according to British Foreign Minister William Hague. Hague also said that the Algerians have reported that they are still trying to clear boobytraps from the site.




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