The human body produces and destroys 15 million blood cells every second.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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On average, the stomach produces 2 L of hydrochloric acid per day.
Shelled invertebrate fossils of the Ordovician period
Representative vertebrate circulatory systems.
How to find the average atomic mass of an element
Embryonic Period
Embryonic Period
This table shows the growth of a crowd at a rally over a 3 h period.