The British Medical Journal recently exposed seven common medical myths: 

1. People need to drink eight glasses of water per day
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

Some of the reasoning for the debunkage is a little tricky (e.g. stubble appears courser because it doesn't include the taper of normal hair), but otherwise it's pretty interesting. #health