Fair warning: Today we’re gonna get gross! We’re talking sounds, smells, and tastes that some people might find repulsive. But we're asking: why? What's the purpose of disgust? Is it something we're born knowing or do we learn to dislike things? When will entomophagy (the eating of insects) catch on everywhere? Plus: The Moment of Um answers the question "Why do worms come out when it rains?"

Today’s episode is sponsored by KiwiCo (kiwico.com/brainson), Ancestry (ancestry.com/brainson) and How to Raise Successful People (RaiseSuccessfulPeople.com). You can support Brains On at brainson.org/fans. And find out more about our book at bit.ly/brainsonbook.