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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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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.

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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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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

The hierarchy of biological classification's eight major taxonomic ranks. The hierarchy of biological classification's eight major taxonomic ranks.
Earth’s Major Tectonic Plates Earth’s Major Tectonic Plates
Activated Natural Killer Cell (NK Cell) Activated Natural Killer Cell (NK Cell)
The reference electrodes are shared by the Nernst cell and the pump cell. The reference electrodes are shared by the Nernst cell and the pump cell.
For each substrate below, choose which reaction type is favored. Place the letter of the ... For each substrate below, choose which reaction type is favored. Place the letter of the ...
Major Minerals List Major Minerals List
Video: Facilitated Diffusion - Glucose transport

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