#5: Your Skin.
Thanks to all the oils in your skin, dead skin flakes act like natural air purifiers, say researchers from Denmark. According to their study, published in the most recent issue of Environmental Science & Technology, one of the most common oils in skin, squalene, reduces levels of the indoor air pollutant ozone, a respiratory irritant that can trigger asthma attacks. After comparing levels of ozone in a day-care center's indoor air with the amount of squalene from skin flakes in its dust, the researchers determined that dead skin flakes can reduce ozone levels anywhere from 2 to 15 percent. Even we aren't sure how to best make use of this information, so please don't go around leaving skin flakes everywhere. But isn't it nice to know your very presence can make the air fresher? Also, ewwwww.