Early American humans hunted car-size armadillos and used their shells for houses.
12
On average a woman has 4 sexual partners in her lifetime.
-143
Yawns are more contagious among people with closer relationships.
163
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
The largest cell in the human body is the female egg and the smallest is the male sperm.
682

