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The horizontal fraction bar was introduced by the Arabs.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.
There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.