Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
Pain occurs when sounds are above 130 db.
124
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
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
Your thumb is about the same size as your nose.
124
Only humans shed emotional tears.
331