A coronavirus pandemic is sweeping the world, but what exactly is a virus? Is it alive?
They're invisible and can make us sick — but how? And why is it so hard for scientists to stop a new virus?
from USATODAY - News Top Stories https://ift.tt/2wT9uY1
They're invisible and can make us sick — but how? And why is it so hard for scientists to stop a new virus?
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