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?

      

March 15, 2020 at 11:00AM https://ift.tt/1roPe8M https://ift.tt/2wT9uY1