Enamel is hardest substance in the human body.
61
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
If your DNA was stretched out it would reach to the moon 6,000 times.
256
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
On average, there's 100 billion neurons in the human brain.
83
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
A man's beard grows fastest when he anticipates sex.
239