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 serve as a beauty trait, and they're also used to add expression to your face. But is that all they do? Why do we have them, and what would happen if they went away?