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Once upon a time, tacos were a Mexican snack. Now they're an all-American institution. Gustavo Arellano leads us across Southern California in search of the roots of the American taco.

President Obama toured the Holocaust Museum in Washington, D.C., on Monday with Nobel Peace Prize winner Elie Wiesel. In a speech there afterward, Obama announced a series of steps to prevent mass atrocities. An executive order signed last night targets those who use information and communication technology in pursuit of human rights abuses.

U.S. election campaigns have become gaffe-centric. Candidates live in fear of letting slip that sentence, or half-sentence, that makes the opposition's day. Catching those moments is the job of the video trackers. They're usually young people, fresh out of college, looking for a way into politics.

American Airlines is asking a judge to revamp its labor contracts. The company says it needs to drastically reduce costs to exit bankruptcy and remain competitive. The airline's unions, on the other hand, are hoping to push a merger with US Airways that may save their labor pacts.

The retrial of baseball great Roger Clemens began in earnest Monday after a week of jury selection. Prosecutor Steven Durham in his opening statement to the jury said Clemens, unlike other baseball greats who owned up to their mistakes, told lies and "other lies to cover up those lies."

The recent scandals surrounding the behavior of U.S. forces in Afghanistan is prompting some soul-searching within the military. After a decade of war, leaders are seeking ways to ensure that troops uphold proper standards of conduct.

The focus of the trial is Adis Medunjanin and the role he allegedly played in a 2009 plot to bomb New York City subways. But the trial itself is a milestone: It's the first time the people dispatched to carry out al-Qaida plots are being heard in open court. One terrorism expert called it a "convention of terrorism suspects."

Health experts warn that the Medicare system is so intertwined with the Affordable Care Act that if the Supreme Court strikes the law down, "it takes everything with it."

President Obama will be touting a plan to keep student loans more affordable. The trip is billed as official business, but it has a political flavor. There will be stops in North Carolina, Colorado and Iowa — all of which are expected to be hard-fought battlegrounds in November.

Weeks ahead of its initial public offering, Facebook released its first quarter profits Monday, and they are down 12 percent from a year ago. At the same time, company expenses have nearly doubled. Facebook attributes some of that to market expansion, which requires more employees and infrastructure.