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Did you know?
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.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
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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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Illicit drug use costs the United States approximately $181 billion every year.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%