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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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The horizontal fraction bar was introduced by the Arabs.

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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.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

The female brain The female brain
Preoptic Area of the Rat Brain Preoptic Area of the Rat Brain
brain brain
Dopamine cannot cross the blood–brain barrier. Levodopa, its precursor, can. Once levodopa crosses ... Dopamine cannot cross the blood–brain barrier. Levodopa, its precursor, can. Once levodopa crosses ...
Neural network in brain Neural network in brain
Mr. jackson's lab result - Chest X-Ray, CT Scan of Brain, and Cerebral Angiogram Mr. jackson's lab result - Chest X-Ray, CT Scan of Brain, and Cerebral Angiogram
Video: The 4 steps of translation Animation

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