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There are approximately 3 million unintended pregnancies in the United States each year.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

The Taung Child, the first of the australopithecines to be discovered, is the type specimen for Aust The Taung Child, the first of the australopithecines to be discovered, is the type specimen for Aust
Anatomically modern humans left archaeological clues, including evidence of burials, which indicate Anatomically modern humans left archaeological clues, including evidence of burials, which indicate
Voltmeter hook-ups for voltage-drop testing of a GM-type cranking circuit. Voltmeter hook-ups for voltage-drop testing of a GM-type cranking circuit.
A roller cell-type electric fuel pump. A roller cell-type electric fuel pump.
World Total Energy Consumption by Fuel Type World Total Energy Consumption by Fuel Type
Canada Total Energy Consumption by Fuel Type Canada Total Energy Consumption by Fuel Type
Video: Hormones and the menstrual cycle Animation

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