"It turns out that although we know that washing our hands prevents a range of illnesses and are incredibly eager to buy products marketed to kill germs, we don't actually take the simpler measure of washing hands in the first place. A study of nearly eight thousand individuals in five U.S. cities found almost half of the participants failed to wash their hands after going to the bathroom. In this light, no mystery salve is necessary, no miracle cure, special wipe, or magic. We need to wash our hands, because soap does the body good, at least in all the ways studied so far. It is not fancy. It is not expensive or heavily marketed and yet it works, as it long has, even though as of yet, no one can conclusively, unambiguously, tell you why."