Hard plant foods may have made up a larger part of early human ancestors' diet than currently presumed, according to a new experimental study of modern tooth enamel. The results have implications for reconstructing diet, and for our interpretation of the fossil record of human evolution, researchers said.

A new computational model shows how different patterns of crop rotation -- planting different crops at different times in the same field -- can impact long-term yield when the crops are threatened by plant pathogens.