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The horizontal fraction bar was introduced by the Arabs.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.