Keep sending your questions for the upcoming interview with the shuttle crew from space.

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In a YouTube video posted Monday, President Obama announced his candidacy for the 2012 election and filed official paperwork with the Federal Election Commission. Gwen Ifill discusses the announcement with political editor David Chalian.

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EDITOR'S NOTE: Paul Solman and Dante Chinni of Patchwork Nation recently traveled to Ohio's Crawford and Delaware counties to examine economic inequality. In a preview of the upcoming story, which is slated to air on Tuesday's broadcast, we're…

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Paul Solman: The last post began to answer Jane Maier's epic email by discussing "heterodoxy" in economics. Today's takes up her second issue: "degrowth." Following her point about the disinclination of economics to invite alternative views, Ms. Maier…

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Today's "Tool$ We Use" features three on the carbon emissions you generate by driving, with a bonus global warming video attached for your viewing discomfort. On the broadcast Monday: a story about electric cars, with a focus…

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In today's arts and culture headlines, more than 100 Brillo boxes said to be works by Andy Warhol have been declared "copies."…

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In today's arts and culture headlines, YouTube and the Guggenheim release a shortlist of the best creative video.

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Publishers -- big houses and small independents alike - have lately turned to video to generate buzz and advertise their new releases. Over the past few years, book trailers have been gaining in popularity as publishers hope to cash in…

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A roundup of arts headlines.

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From a bedroom in the San Francisco Bay area, Salman Khan is using the Web to teach math and science to millions. Spencer Michels reports on how the non-profit Kahn Academy is providing educational materials through its free YouTube video…

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