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President Obama and Egyptian President Hosni Mubarak, seen here in August 2009, have little to laugh about now. The protests and uncertainty in Egypt pose a foreign policy dilemma for Washington: stick with the Mubarak government or back the pro-democracy movement? Mark Wilson/Getty Images hide caption

itoggle caption Mark Wilson/Getty Images

Anti-Government Protests Roil Egypt

In Egyptian Uprising, A Tale Of Two Risks For U.S.

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Researchers have sequenced the genome of the common water flea, Daphnia, shown in this false-color micrograph. About 35 percent of the genes are brand new to science. Jan Michels/Christian-Albrechts-Universitat zu Kiel hide caption

itoggle caption Jan Michels/Christian-Albrechts-Universitat zu Kiel

Animals

Tiny Water Flea Clocks In Record Number Of Genes

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A man dressed in Southern Sudan paraphernalia — a pin and tie — celebrates the announcement of the preliminary results of the independence referendum in Juba on Sunday. Phil Moore/AFP/Getty Images hide caption

itoggle caption Phil Moore/AFP/Getty Images

Africa

In Southern Sudan, Nation Begins 'From Scratch'

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