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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
There are 60,000 miles of blood vessels in every adult human.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Illicit drug use costs the United States approximately $181 billion every year.
About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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