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Did you know?

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 lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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Your heart beats over 36 million times a year.

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Video: Arthritis

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