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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
More than 4.4billion prescriptions were dispensed within the United States in 2016.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."