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Today’s whales look nothing like their ancient ancestor. A small furry carnivore that lived both on land and sea is the ancestor of modern whales. Calling all NOVA superfans to join our new community! Get access to exclusive content, badges, emojis and more: https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA/join Shop official NOVA 50th anniversary merch: […]

The chemical that makes chili peppers so hot evolved to keep animals from eating the plants, but humans have learned to like the sensation. How does a chili pepper make your mouth feel like its on fire? When you eat peppers, capsaicin molecules fit into the heat pain receptors of […]