Enamel is hardest substance in the human body.
61
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The human eye blinks an average of 4,200,000 times a year.
233
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Our brains have a negativity bias and will remember bad memories more than good ones.
15
The average sperm cell swims at 8 inches per hour.
4
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13