Listen to the first three episodes of Eons: Mysteries of Deep Time: https://podcasts.apple.com/us/podcast...

While sour taste's original purpose was to warn vertebrates of danger, in a few animal groups, including us, its role has reversed. The taste of danger became something it was dangerous for us to avoid.

Thanks to Ceri Thomas (https://nixillustration.com/) and Julio Lacerda (  / juliotheartist  ) for the excellent reconstructions featured in this video!

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References: https://docs.google.com/document/d/1s...