The familiar sounds of your heart are made by the heart's valves as they open and close.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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There are approximately 3 million unintended pregnancies in the United States each year.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
The path of sound waves through the outer, middle, and inner ear.
Middle nasal conchae
The Ear/Hearing
Change in Drawing Abilities from Early to Middle Childhood Drawings become more realistic as fine m