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Earthworms and charcoal help plants resist infections, according to research by Anne Merrill, a finalist in the 2014 Intel Science Talent Search.
Certain chemicals, including many in foods, fight chemical reactions that could harm cells in the body and in wildlife.
Experts are trying to work out new rules on which foods to eat and which ones to avoid.
When people crossed from Asia to the Americas thousands of years ago, burning dung may have kept them warm.