The human brain is more active during sleep than during the day.
28
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
You can't tickle yourself.
29
The human brain doesn't stop developing until about 25 years old.
102
A human being loses an average of 40 to 100 strands of hair a day.
133
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
We share 70% of our DNA with a slug.
218
A man's beard grows fastest when he anticipates sex.
239