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Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
The human body produces and destroys 15 million blood cells every second.

