You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
If your DNA was stretched out it would reach to the moon 6,000 times.
256
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Your thumb is about the same size as your nose.
124
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89