Are chemicals in our environment masculinizing girls and feminizing boys? A growing body of scientific evidence suggests that this is the case, and one of the latest studies has linked exposure to a substance known as bisphenol A, or BPA, with aggressive behavior in girls. Liz Szabo reports on the research in USA Today, writing, “In the study of 249 pregnant women, the first to examine the effects of BPA on children's behavior, researchers found that girls ... were more likely to be aggressive if their mothers had high levels of BPA — an estrogen-like chemical used in many consumer...