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Did you know?
More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
Did you know?
Medication errors are more common among seriously ill patients than with those with minor conditions.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
![American soldiers—some of them regulars in deep blue uniforms, others in buckskin cowboy outfits— fi](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_50_223155.jpeg)
![A woman in a net on a Congo shore. Although the importation of slaves was illegal after 1807, histor](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_52_223212491.jpeg)