Article: When Does Your Brain Stop Making New Neurons? A. Infant; B. 42 Years Old; C. 53 Years Old.(Cover story)

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CORRECTION: In "Links Between Past and Present" ("What You Need to Know Now," July 9), we should have said that the Pakicetus, which was found in 1980, is an ancestor of ancient whales and a descendant of four-legged land mammals, not the other way around. NEWSWEEK regrets the error.

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Byline: Sharon Begley

The scientists are not so naive as to think they have discovered a magic wand that can turn animosity into compassion and hatred into benevolence, but the tarantula definitely raised their hopes. Over the years psychologists Phillip Shaver and Mario Mikulincer had uncovered more and more evidence that people's sense of ...

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