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Did you know?

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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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The average office desk has 400 times more bacteria on it than a toilet.

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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Synthesis of the amine hormones dopamine, norepinephrine, and epinephrine. Synthesis of the amine hormones dopamine, norepinephrine, and epinephrine.
figure 18-1 pituitary hormones figure 18-1 pituitary hormones
Daily Water Balance in the Body Daily Water Balance in the Body
Factors that Influence Pulse Rate Factors that Influence Pulse Rate
Connections of carbohydrate, protein, and lipid metabolic pathways Connections of carbohydrate, protein, and lipid metabolic pathways
Hormones and Aggression Hormones and Aggression
Video: Interpreting a cladogram Animation

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