Medication errors are three times higher among children and infants than with adults.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Movement of sound waves through the human ear.
Sites of mtDNA mutations in certain human diseases
Major cell types in the human body.
The anterior and posterior human skeleton.
A single cell from an early-stage human embryo
Cast of a Fossil Dunkleosteus, with a human to illustrate scale