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Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
Did you know?
The average office desk has 400 times more bacteria on it than a toilet.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
![New England children like David, Joanna, and Abigail Mason (painted by an unknown artist around 1670](https://biology-forums.com/gallery/47/medium_374628_15_08_15_11_48_07_222261695.jpeg)
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