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Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).