Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Yawns are more contagious among people with closer relationships.
163
It takes approximately 12 hours for food to entirely digest.
93
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
The human body contains over a billion miles of DNA.
147