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Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Video: Electrical Conduction System of the Heart

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