Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
There's 100 trillion good bacteria living in your body.
17
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Your body is creating and killing about 2.4 million red blood cells per second.
17
Your thumb is about the same size as your nose.
124
Your heart will pump about 212 million liters in its lifetime.
26
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
If you hold farts in during the day, they'll just come out when you sleep.
16