The human eye blinks an average of 4,200,000 times a year.
233
You can't tickle yourself.
29
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Tigers can see 6 times better at night than humans.
305
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99