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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Medication errors are more common among seriously ill patients than with those with minor conditions.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
The Grants and natural selection of beak size among the medium ground finch.
bacterial cell
A bacterial virus
Initiation and elongation steps of transcription by bacterial RNA polymerase