In a never-ending quest to eliminate human contact with germs, science has given society a number of hygienic chemicals. Among these chemicals are Triclosan, found commonly in anti-bacterial soaps, toothpaste, and many other products, and Bisphenol A (BPA), found in the protective lining of food cans. A new study from researchers at the University of Michigan (UM) in Ann Arbor suggests that these chemicals may be detrimental to the immune system and cause allergies.