Uploaded May 2016 | Updated September 2026, 36 minutes ago

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Did you know there are over 1000 different kinds of bacteria and other microorganisms living in your body? Biologist Elaine Hsiao explores the hidden world of microbial communities inside of us and in our surroundings.

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Produced in partnership with the Kavli Foundation.

Featuring Elaine Hsiao, UCLA Dept. of Integrative Biology and Physiology.

Illustrated by Jorge Cham
Animated by Roser Segura - rosersegura.tv
Narrated by Meg Rosenburg
Thanks to Lindsay Borthwick, Caroline Montojo and Jim Cohen