The average sperm cell swims at 8 inches per hour.
4
Human hair and fingernails continue to grow after death.
7
The average person will go on a date at least 100 times before they finally marry.
33
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
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Tigers can see 6 times better at night than humans.
305