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Corn is everywhere, even inside us. Most things we touch and eat all contain corn or its derivatives, as the crop has found its way in to most of our food supply, from animal feed to burger patties. By testing strands of people's hair, Dr Stephen Macko can see how much of us is made up of corn - in some cases, it's as high as 90%. (Image: A man eating a burger. Credit: Joe Raedle /Getty Images)