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Also: Explosion rocks Kansas City; Office Depot and Office Max to merge; Jesse Jackson Jr. expected to plead guilty; NHL's Blackhawks tie record for best start.

Also: Obama looks for "spring thaw" with Congress; Chávez's final words; Berlusconi's conviction; and winter storm moves into New England.

Also: Nelson Mandela remains hospitalized in serious but stable condition; Apple has some announcements to make; and was the Tony Awards' opening the best ever?

Also: U.S. spied on United Nations, German media report; jurors to soon begin weighing death penalty for Fort Hood killer; George Zimmerman will ask state of Florida to pay hundreds of thousands of dollars in legal bills.

In entertainment news: Netflix has its day in the sun, receiving nominations for "House of Cards" and its reboot of "Arrested Development."

Also: Pope John Paul II to become a saint; Egypt braces for violence; prosecution wraps up case in Trayvon Martin murder trial; Desmond Tutu urges Mandela family to end its feud.

Also: Tip from retired Idaho sheriff led to discovery of missing teen, killing of alleged abductor; one of last Nazi war crimes suspects dies; Elon Musk prepares to reveal his "hyperloop" plans.

Also: Obama to warn Iran; China launches first aircraft carrier; controversial call adds to outrage over NFL's replacement referees.

Also: Blast kills young girls in Afghanistan; Egypt's draft constitution gets support in first stage of voting; Sen. John Kerry expected to be tapped for secretary of state.

Six-player Texas Hold 'em has been too tough for a machine to master — until now. A bot named Pluribus crushed some of the world's best poker players using brash and unorthodox strategies.