What if humans only needed to poop twice a year? Listener Randy Woods sent in this fascinating question that explores everything from subway systems suddenly smelling fresher to plumbers planning career changes in a world where human waste becomes a rare event. Dive into the fascinating science of gut microbiomes, learn why having "zero waste" might wreak havoc on Earth's ecosystems, and discover why some scientists think the total elimination of poop could cause an evolutionary crisis. Through engineered gut bacteria or artificially created super-digestible food, this episode examines how our bodies would need to change to achieve this drastically different biological reality.

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