The first prehistoric chef who looked out at a field of grass in Africa and said, "dinner!" may have helped our ancestors use new resources in new locations. Roberto Schmidt/AFP/Getty Images hide caption

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Blaine Badick walks through floodwaters with her dogs in Hoboken, N.J., on Wednesday. Brendan Smialowski/AFP/Getty Images hide caption

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Actors Stan Laurel and Edna Marlon play at socializing around the campfire. It turns out that early man's brain developed in part thanks to cooking. Hulton Archive/Getty hide caption

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Megan Lutz, left, and Justin Chun react to amateur comedian Robert Lynch at the Metropolitan Room in Manhattan, N.Y. Lynch is an anthropologist researching what laughing reveals about us. Melanie Burford for NPR hide caption

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Gorillas are fine with being herbivores, like this one at a Seattle zoo. But humans evolved as omnivores. Is diet destiny? Ted S. Warren/AP hide caption

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