Tigers can see 6 times better at night than humans.
305
The world's shortest man measures only 21.5 inches.
73
A human being loses an average of 40 to 100 strands of hair a day.
133
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
A person can live without food for about a month, but only about a week without water.
156
Enamel is hardest substance in the human body.
61
Your thumb is about the same size as your nose.
124