Carl Zimmer on Bird Flu and Beyond

Aired: 6/21/2012 | 0:07:35 | Clip
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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