And public bathrooms are especially gross. After all, they don't have lids on their toilet seats, so when you flush, it launches a spray of bacteria nearly 2 meters away, onto the stall walls ...

David Lynchian reconstruction of a public bathroom. The space was awash in a red light, and the walls were flanked by basic sinks and mirrors as well as doors to toilet stalls. Guests had fun ...

Other hot zones in public bathrooms include sinks, faucet handles, and towel dispensers. Picture someone emerging from a bathroom stall, and turning on the faucet with dirty hands, and you'll know ...