Top 10 Weird Medical Facts of the Week

1. About one third of the human race has 20-20 vision.

2. In a hot climate, you can sweat as much as 3 gallons of water a day.

3. Fingernails are made from the same substance as a bird's beak.

4. A runner consumes about 7 quarts of oxygen while running a 100-yard dash.

5. The enamel in your teeth is the hardest substance in your body.

6. Your teeth start growing 6 months before you are born.

7. Your big toes have two bones each while the rest have three.

8. A pair of human feet contain 250,000 sweat glands.

9. Living brain cells are bright pink.

10. You're ears secrete more earwax when you are afraid than when you aren't.