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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Early instructions for administration of the small pox vaccine. Early instructions for administration of the small pox vaccine.
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Video: Hormonal feedback loop components

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