Lots More Information
- How Sweat Works
- Why do humans have body hair?
- Why is the hair on your arm short but the hair on your head long?
- How fast does hair grow?
- How Hair Replacement Works
- How Hair Coloring Works
Back away from that speaker, turn down that iPod and put down that power tool unless you want the ringing in your ears to remain permanent. Sound can hurt you, and that ringing may be the first sign.
Eyebrows add expression to your face, and are often waxed and plucked in the name of beauty. But why do we have them in the first place, and what would happen if they went away?