|
|
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
Did you know?
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

