Yawns are more contagious among people with closer relationships.
163
Early American humans hunted car-size armadillos and used their shells for houses.
12
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
In one day, adult lungs move about 10,000 litres of air.
11
The human brain is more active during sleep than during the day.
28
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
If the human eye was a digital camera, it would have 576 megapixels.
25
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