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TIL The first air conditioner was created not for cooling a room but to prevent humidity causing swelling pages and blurry prints in a printing press (www.smithsonianmag.com)

At the turn of the 20th century, humidity threatened the reputation of Brooklyn’s Sackett-Wilhelms Lithographic and Publishing Company’s high-quality color printing. After two summers of extreme heat disrupted business and caused swelling pages and blurry prints, the printing company found that a nascent cooling industry...

TIL May Day, not on the same day as US Labor Day, started "in commemoration of the Haymarket Riot in Chicago (1886)." (www.britannica.com)

In 1889 an international federation of socialist groups and trade unions designated May 1 as a day in support of workers, in commemoration of the Haymarket Riot in Chicago (1886). Five years later, U.S. Pres. Grover Cleveland, uneasy with the socialist origins of Workers’ Day, signed legislation to make Labor Day—already...

TIL JSFuck, an esoteric subset of JS that only uses operators, could be used to hack eBay customers by injecting it into item listings. As JSFuck obfuscated the actual code, attackers were able to get browsers that see the listing to run external scripts. (arstechnica.com)

This news is from almost exactly 8 years ago. Softpedia reported 13 days later that eBay partially patched it, but the patch was insufficient. I could not find further updates, but I do know that eBay has since removed more advanced JavaScript (incl. JSFuck) from all listings in 2017....

TIL Black mold is used in the manufacturing of Citric Acid

The substrate for the fermentation is a carbohydrate, usually molasses or a sugar, such as raw beet, refined beet, or cane sugars, or a syrup. … Certain inorganic nutrients, such as ammonium nitrate, potassium phosphate, magnesium sulfate, zinc sulfate, and potassium ferrocyanide, are added. The pH is adjusted to between 3 and...

TIL the term "Mad as a Hatter" likely came from hat makers using mercury and the resulting mercury poisoning. (en.wikipedia.org)

Mercury poisoning of hat-makers – In 18th and 19th century England, mercury was used in the production of felt, which was commonly used in the hat-making trade at the time. Long-term use of mercury products often resulted in mercury poisoning-induced erethism among hat-makers.[1][2] In the late 19th-century United States, a...

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