NOVA

How Viruses Like the Novel Coronavirus Evolve

Clip: Season 47 Episode 9 | 2m 53s Video has closed captioning.

There are more viruses than stars in the universe, and luckily, most are harmless to us. But danger can come when we're exposed to a virus we’ve never encountered before.

Aired: 05/13/20

Rating: NR

Problems Playing Video? | Closed Captioning

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