Researchers have long known that exercise is good for the brain. An enzyme produced by muscles might help explain why. Monalyn Gracia/Corbis/VCG/Getty Images hide caption

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A Protein That Moves From Muscle To Brain May Tie Exercise To Memory

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The researchers were inspired by working with ultramarathoners, who can be sidelined by blisters despite years of training. These runners competed in the 2007 Badwater Ultramarathon in Death Valley, Calif. Chris Carlson/AP hide caption

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Izaic Yorks, a senior at the University of Washington, recently ran a mile in 3:53 — the fastest mile of any American collegiate athlete. Here, he competes on Feb. 27 in Seattle. Stephen Brashear/Red Box Pictures hide caption

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Why Fastest U.S. College Mile Runner Won't Be Vying To Be NCAA Champ

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Haneen Radi, an Arab Israeli, wants to organize a marathon for her town of Tira, but was told the run couldn't include women. When she insisted, she received threats, and the back window of her car was shot out. Emily Harris/NPR hide caption

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Trying To Organize A Marathon, An Arab-Israeli Woman Runs Into Opposition

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From Skid Row To Rome: The Story Of An Unusual Running Club

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British Runner Leaps Feet-First Into Marriage

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