Keith Ballard, right, of the Vancouver Canucks is tripped by Colin Fraser of the Los Angeles Kings for a penalty during game in Los Angeles on April 18. Researchers studying hockey penalties found that teams wearing black jerseys were far more likely to draw penalties than teams wearing other colored or white jerseys. Harry How/Getty Images hide caption

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Local officials burn chicken coops in anticipation of a resurgence in bird flu in Jakarta, Indonesia, in January. Concerns about potential misuse of research into genes that control the contagiousness of flu have stymied publication. Tatan Syuflana/AP hide caption

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In this undated picture, Mount Everest, the world's tallest mountain at 29,029 feet, stands behind the Khumbu Glacier, one of the longest glaciers in the world. Nepal has more than 2,300 glacial lakes, and experts say at least 20 are in danger of bursting. Subel Bhandari/AFP/Getty Images hide caption

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Bo Van Pelt celebrates his hole-in-one during the final round of the Masters on April 8. New research suggests that golfers may be able to improve their games by believing the hole they're aiming for is larger than it really is. Andrew Redington/Getty Images hide caption

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Survey participants in a UCLA study were asked to look at pictures of a hand holding different items and guess how tall, how big and how muscular the person connected to that hand actually was. Karen Bleier/AFP/Getty Images hide caption

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Researchers studied baboons, including this one, and found that with training, they could distinguish real four-letter English words from four letters that weren't a word. Joel Fagot/Science/AAAS hide caption

itoggle caption Joel Fagot/Science/AAAS

An artist's impression of a group of Yutyrannus. The 30-foot-long dinosaurs were covered with downy feathers — likely to keep the animals warm. Dr. Brian Choo/Nature hide caption

itoggle caption Dr. Brian Choo/Nature