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Trillions of bacteria living in and on the human body play a vital role in preserving health. But C-section births, antibiotics and excessive hygiene have been disturbing our microbial balance and possibly contributing to intestinal ailments, obesity, allergies and autism.

Deep in the Amazon basin, where traditional hunter-gatherers still live, researchers gave the indigenous population a lesson in biology. They used posters to explain to the inhabitants of the rain forest that a human being is never alone. Invisible, tiny creatures known as bacteria live on and inside our bodies -- and they can be quite useful.