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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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Video: Hormonal regulation of pregnancy - weeks 17 through 38

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