Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
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
You forget 90% of your dreams.
256
Our brains have a negativity bias and will remember bad memories more than good ones.
15
On average, there's 100 billion neurons in the human brain.
83
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
35
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13