EonBlue

Thanks Pharyngula

From Reuters:

These well-worn theories are among seven “medical myths” exposed in a paper published Friday in the British Medical Journal, which traditionally carries light-hearted features in its Christmas edition. Two U.S. researchers took seven common beliefs and searched the archives for evidence to support them.

The complete lack of evidence has been recorded in a study published the American Journal of Psychology, they said.

(emphasis mine)

Here they are:

1. Drink eight glasses of water a day to stay healthy
2. Reading in dim light ruins your eyesight
3. Shaving makes hair grow back faster or coarser
4. Eating turkey makes you drowsy
5. We use only 10 percent of our brains
6. Hair and fingernails continue to grow after death
7. Mobile phones are dangerous in hospitals

So now we know, and knowing is half the battle!