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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

The African Pygmy Goose (Nettapus auritus) is a very small perching duck from sub-Saharan Africa. The African Pygmy Goose (Nettapus auritus) is a very small perching duck from sub-Saharan Africa.
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Video: Energy sources - types

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