Only humans shed emotional tears.
331
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Your thumb is about the same size as your nose.
124
It takes approximately 12 hours for food to entirely digest.
93
Every human spent about half an hour as a single cell.
144
Tigers can see 6 times better at night than humans.
305
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
You can't tickle yourself.
29