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Professor Jordan Ellenberg gives students points for recognizing when they get a wrong answer, even if they can't figure out why. In his new book, he writes that good math is about good reasoning.

In a visit to Washington, the Ukrainian leader faces a small but growing chorus of skepticism at new funding for the war, as $24 billion of aid hangs in limbo ahead of a possible government shutdown.

David Greene talks to Danya Greenfield, deputy director of the Rafik Hariri Center for the Middle East, about al-Qaida's presence in Yemen and the nature of U.S. counterterrorism operations there.

The temporary truce that collapsed early Friday followed seven weeks of fighting in Gaza sparked by simultaneous attacks on southern Israel by Hamas militants on Oct. 7.

The hitter had a swing so pure and flawless that Mickey Mantle would watch him take batting practice. But he was also a tormented soul who hurt a lot of people, including himself. Ben Bradlee Jr. delivers a deeply personal account of Williams' life in The Kid.

Brown was a music industry survivor, but he wasn't as indestructible as he seemed to believe. RJ Smith's new biography The One presents the soul godfather as an unparalleled performer undone by drugs and violence.

Johnson plays key political role raising money and driving campaign strategy as speaker. Democrats say the new speaker's policies make him an issue, but his low national profile could make that hard.

Sen. Jon Tester of Montana will have to walk a fine line as a Democrat running for re-election in a state where Donald Trump is popular. Will his strategy of appearing moderate work?

Reddit, the San Francisco social media site that describes itself as "the front page of the internet," is debuting as a public stock on Thursday.

In Minneapolis this week, the best gymnasts in the U.S. are competing to make the team that will compete at next month's Olympics in Paris. Simone Biles aims to make her third Summer Games.