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#348 – Nathalie Cabrol: Search for Alien Life
Lex Fridman Podcast
How Do Bacteria Survive High UV Rays?
Bacteria have adapted to very high UV radiation, and it's because early Earth didn't have an ozone layer. The ancestors of those bacteria originated in a world where you had lots of short UV coming down at the surface. Depending on the environment, they are going to switch some of these defenses adaptation on or off. But if you find them here in California, they will turn their protection against UV during the day in summer, and they will switch it off at the end of the day.
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