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

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Medication errors are more common among seriously ill patients than with those with minor conditions.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

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More than 4.4billion prescriptions were dispensed within the United States in 2016.

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