Enamel is hardest substance in the human body.
61
You forget 90% of your dreams.
256
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
If the human eye was a digital camera, it would have 576 megapixels.
25
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Your thumb is about the same size as your nose.
124