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and that's food and that would have been favored by natural selection. And interestingly, at the end of the ice age, the male height was around 1.75 meters, 5.7 feet. And by met Holocene, it had dropped to 1.65 meters, 5.4 feet. Height of increase in the ice, and most parts of the world and our brains might be rebounding as well. And warming of the planet may be another factor. Bodies become thinner and warmer climates increase surface area and dissipate heat. Large brains consume lots of energy. They produce about 20% resting energy and more heat. And when food is here, a larger brain can go like this in the eye.