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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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Sigmund Freud viewed healthy personality development as resulting from the resolution of ... Sigmund Freud viewed healthy personality development as resulting from the resolution of ...
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Video: Darwin's Observation (Fossils, Galapagos Islands & Africa ) and Natural Selection (Adaptive Traits)

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