Note: for the most part, those bacteria are necessary to keep you healthy and living. Note: a lot of this comes from eating at your desk. Note: oftentimes, practiced liars have an easier time passing a polygraph than a squeaky clean choir boy. Why? Because compulsive liars and psychopaths are used to lying. The choir boy, on the other hand, would get nervous if you even question his motives. 25-20. pixabay (public domain), 19. wikimedia commons (public domain), 18-1. pixabay (public domain)