A man's beard grows fastest when he anticipates sex.
239
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Human hair and fingernails continue to grow after death.
7
The human brain doesn't stop developing until about 25 years old.
102
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
It takes approximately 12 hours for food to entirely digest.
93