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Saul Perlmutter

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20111004-183910-pic-194264922.jpg

Saul Perlmutter, at his home in Berkeley, Calif., is all smiles Tuesday after learning he had won the Nobel Prize in physics. He shared the prize with Brian Schmidt and Adam Riess for their work mapping the universe's expansion by analyzing a particular type of supernova, or exploding star. (Associated Press)