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Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
The average adult has about 21 square feet of skin.