The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
There's 100 trillion good bacteria living in your body.
17
The human body contains over a billion miles of DNA.
147
In 1996, research found that having excessive body hair is linked to higher intelligence.
23

