Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
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
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
Enamel is hardest substance in the human body.
61
Yawns are more contagious among people with closer relationships.
163
Early American humans hunted car-size armadillos and used their shells for houses.
12
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139