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The worst of nature and the worst of science may bring the human race to the very brink of extinction.
Each year billions of people get infected with viruses-with common ones like influenza and cold viruses, and rarer ones like polio and Ebola.
The viruses don’t stay all that long inside of us. In most cases our immune systems wipe them out, except for a few refugees that manage to escape to a new host and keep their species alive.
In some cases the viruses kill their unfortunate hosts and end their own existence as well. But in some exquisitely rare cases, viruses meld with the genome of their hosts and become part of the genetic legacy their hosts pass down to future generations….