Leave your feedback Share Copy URL https://www.pbs.org/newshour/show/carl-zimmer-on-bird-flu-and-beyond Email Facebook Twitter LinkedIn Pinterest Tumblr Share on Facebook Share on Twitter Story 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.”