The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The pupil of the eye expands as much as 45 percent when a person looks at something pleasing.
130
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
The aorta, the largest artery in the body, is almost the diameter of a garden hose.
37
Obsessive nose picking is called Rhinotillexomania.
101
Laughing could dramatically improve your health – and be as good for you as a deep state of meditation, researchers have found.
28
Medical research has found substances in mistletoe that can slow down tumor growth.
32
The average sperm cell swims at 8 inches per hour.
4