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Asthma cases in Americans are about 75% higher today than they were in 1980.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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The average adult has about 21 square feet of skin.

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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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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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