President Obama is in South Korea Sunday to take part in a multilateral conference aimed at curbing nuclear proliferation. He arrives in South Korea at a time of considerable tension. North Korea is threatening to carry out a long-range rocket launch in April, an action the U.S. has warned it should not take.
On this day in 1997, Boris Kasparov, the world's top chess player, faced off against IBM's chess-playing supercomputer, Deep Blue — and lost. This week, professional poker players are trying something similar in Pittsburgh, and they're winning.
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