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President Bush arrives at the G-8 summit in Germany on Wednesday with a new plan on climate change as leaders of major industrialized countries gather for three days. But a bitter debate over missile defense looms over the talks.

Weekend Edition guest host Don Gonyea speaks with Silvio Pietroluongo of Billboard Magazine about the recent changes to the formula for the "Hot 100" chart. Billboard now incorporates the number of views on YouTube to determine the top songs in the country.

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.

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

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

Also: Syria's rebels accused of killing civilians; and Utah finds a way to reopen its national parks.

Also: South Africa's governing party recalls President Zuma; the heads of U.S. intelligence agencies will speak to a Senate panel today; and no, a dog can't run for Kansas governor.

Also: Earthquake survivors are desperate for aid in Iran; California school officials protected kids from a shooter by locking down the school; and baseball names its Managers of the Year.