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Did you know?
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The human body produces and destroys 15 million blood cells every second.