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Did you know?

More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

Sigmund Freud (1856–1939). Austrian doctor who founded the psychoanalytic school of psychology. ... Sigmund Freud (1856–1939). Austrian doctor who founded the psychoanalytic school of psychology. ...
One target for expanding medical services involves vaccinations. Only 78 percent of children ages 19 ... One target for expanding medical services involves vaccinations. Only 78 percent of children ages 19 ...
Homeless people sleeping on the streets is a common sight in India’s cities. I took this photo in ... Homeless people sleeping on the streets is a common sight in India’s cities. I took this photo in ...
Photos of starving children, such as this child in Somalia, haunt Americans and other members of the ... Photos of starving children, such as this child in Somalia, haunt Americans and other members of the ...
Should School Meals Align with the Dietary Guidelines for Americans? Should School Meals Align with the Dietary Guidelines for Americans?
Children and Their Development, Third Canadian Edition Children and Their Development, Third Canadian Edition
Video: Osteoporosis

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