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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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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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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