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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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The horizontal fraction bar was introduced by the Arabs.