15 Disturbing Facts You Really Don't Want To Know

Coffee cup

A dirty coffee cup (you know, the one with the brown film still sitting on your desk from yesterday) is the single most bacteria-ridden item of those measured, according to Gerba’s research, with 2,200 bacteria per square inch. Clean that cup thoroughly and you cut that number down to just 110 bacteria per square inch. But the key word here is “thoroughly” — use the bacteria-laden office sponge from the shared kitchen to wipe out that cup, and you’re not getting anywhere close to that 110 number.