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Shawn Colvin Sings 'All Fall Down'

Shawn Colvin Sings 'All Fall Down'

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Egypt's First Civilian President to Take Helm of Country

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Supreme Court Upholds Controversial Part of Immigration Law

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PBS News Hour

Carl Zimmer on Bird Flu and Beyond

Here are just a few of the fascinating facts from Carl Zimmer's book, "A Planet of Viruses": If you put all the viruses in the ocean on a scale, they would equal the weight of 75 million blue whales. And if you lined up all those viruses end to end, "they would stretch out past the nearest 60 galaxies."
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