As Bill breaks down the science of aging, his correspondents try bizarre beauty treatments and learn how spinach could transform organ transplants.
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Derek Muller discovers why Mexico City is sinking, Nazeem Hussain tests his desert survival skills, and Bill has a drink with a "water sommelier".
Bill explains how addiction changes the brain, comedian Maria Bamford shares her struggles, and Cara Santa Maria visits a research lab casino.
Karlie Kloss tours Japanese farms that grow produce without soil to save water and space. Back in the studio, Margaret Cho samples meat made in a lab.
In London, mutated mosquitos make a meal of Derek Muller. Comedian Paul F. Tompkins helps Bill burst a common myth about evolution.
Do dogs get depressed? Do monkeys like magic tricks? Bill and his guests explore animal behavior that's remarkably human
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