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American Association for the Advancement of Scienc: President Obama reads "Green Eggs and Ham"
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American Association for the Advancement of Scienc: President Obama waves to the crowd
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American Association for the Advancement of Scienc: Michelle Obama reads "Horton Hatches an Egg"
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American Association for the Advancement of Scienc: Hundreds of children and families visited the AAAS "Science of Spring" exhibits,
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American Association for the Advancement of Scienc: AAAS staff prepared for the throngs of children
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American Association for the Advancement of Scienc: Gabriel Caprio
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American Association for the Advancement of Scienc: At the dissection microscope
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American Association for the Advancement of Scienc: Apolo Anton Ohno
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American Association for the Advancement of Scienc: At the dissection microscope
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American Association for the Advancement of Scienc: Benjamin Crawford