Yawns are more contagious among people with closer relationships.
163
Enamel is hardest substance in the human body.
61
When you take a step, you are using up to 200 muscles.
886
One human hair can support 3 ounces.
191
The average person's skin weighs twice as much as their brain.
131
The human brain doesn't stop developing until about 25 years old.
102
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92