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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Though newer “smart” infusion pumps are increasingly becoming more sophisticated, they cannot prevent all programming and administration errors. Health care professionals that use smart infusion pumps must still practice the rights of medication administration and have other professionals double-check all high-risk infusions.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Video: Bond types - Atomic structure and basis of bonds

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