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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

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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 familiar sounds of your heart are made by the heart's valves as they open and close.

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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

Refinement of skills and a growing sense of independence are most noted in toddlers Refinement of skills and a growing sense of independence are most noted in toddlers
School-age children are often independent and industrious, with a developing sense of self-confidenc School-age children are often independent and industrious, with a developing sense of self-confidenc
Beware of “Common Sense” Explanations Beware of “Common Sense” Explanations
Will the sun rise tomorrow? Are you sure? “Cause and effect” vs. sense experience. Will the sun rise tomorrow? Are you sure? “Cause and effect” vs. sense experience.
Psychology: It’s Not Just “Common Sense” Psychology: It’s Not Just “Common Sense”
Human sense of smell Human sense of smell
Video: Primate Evolutionary Tree Animation

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