A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
You can't tickle yourself.
29
The human brain is more active during sleep than during the day.
28
Yawns are more contagious among people with closer relationships.
163
The human eye blinks an average of 4,200,000 times a year.
233
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198