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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Cleavage with trypsin and papain separates the myosin heads Cleavage with trypsin and papain separates the myosin heads
Five Areas for listening to the heart Five Areas for listening to the heart
A Passive Continental Margin A Passive Continental Margin
Bolts and screws have many different heads. The head determines what tool is needed. Bolts and screws have many different heads. The head determines what tool is needed.
Passive movement of the hip through its full range. With one hand just above the knee and the other ... Passive movement of the hip through its full range. With one hand just above the knee and the other ...
Mechanisms of active and passive immunity Mechanisms of active and passive immunity
Video: Types of disease resistance: innate defenses & immunity

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