Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
A person can live without food for about a month, but only about a week without water.
156
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
You forget 90% of your dreams.
256
Your thumb is about the same size as your nose.
124
On average, there's 100 billion neurons in the human brain.
83
Enamel is hardest substance in the human body.
61
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111