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Author and screenwriter Nora Ephron died Tuesday in New York. She was 71. Stephen Lovekin/Getty Images hide caption

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Harriet Russell

Beer may be the oldest fermented beverage on the planet. iStockphoto.com hide caption

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Christopher Reeve played Superman in Richard Donner's 1978 film. Larry Tye has written a new biography of the Man of Steel. Anonymous/AP hide caption

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A new biography of President Obama provides a rare glimpse of him as a young adult. In Barack Obama: The Story, journalist David Maraniss chronicles the president's "classic search for home." AP hide caption

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Harriet Russell
Harriet Russell

Yogurt is produced by the bacterial fermentation of milk. "Bacteria in our gut enable us to live," says author Sandor Katz. "We could not survive without bacteria." iStockphoto.com hide caption

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