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TIL Frequent use of painkillers for a headache causes more headaches. It's called medication overuse headaches.

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xV0n5 TIL: Mushrooms are the only vegetarian food that can make vitamin D. They contain a “pro-vitamin,” or precursor, called ergosterol that is converted into vitamin D when exposed to the sun's ultraviolet (UV) radiation—similar to how your skin synthesizes the vitamin in response to sun exposure.
xVaog TIL that after being prohibited from wearing shorts during the hot summer months, bus drivers in Sweden wore skirts to work, citing that since their women coworkers could wear skirts, it would be discriminatory to prohibit them from wearing skirts too.
gMrEb TIL Roman soldiers were paid in salt, or "sale" in Italian (and "sal" in Spanish), which grew into the modern English word of "salary."
N7mrE TIL there is a psychological disorder called utilization behavior. People affected by it find it difficult to ignore anything in front of them - for example, if presented with a toothbrush, they'll brush their teeth, regardless of the situation. The disorder is also linked to hypersexuality.
x6A90 TIL only two countries have money that are non-decimal currencies: Mauritania, where 1 ouguiya = 5 khoums, and Madagascar, where 1 ariary = 5 iraimbilanja. There was an attempt to undecimalise units of time during the french revolution but it failed.