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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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If you could remove all of your skin, it would weigh up to 5 pounds.

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