American Association For The Advancement Of Science
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White House pastry chef Bill Yosses exchanges his white apron for a bow tie Saturday, Feb. 19, 2011, to tell scientists in Washington how chefs are changing perceptions of tastes during an American Association for the Advancement of Science presentation on the science of taste. (AP Photo/Jacquelyn Martin)

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Thomas H. Kunz, of Boston University takes part in a panel discussion on the use of radar to study bats, Friday, Feb. 18, 2011, during the the annual convention of the American Association for the Advancement of Science, in Washington. (AP Photo/Jacquelyn Martin)