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TIL printers embed tracking codes as hidden yellow dots on pages, revealing who printed what and when

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dDXgE TIL French personalities the Bogdanoff twins were the grandsons of Roland Hayes, one of the first successful Black classical composers. A Czech countess, Bertha Krakowska-Kolowrat, had an affair with Hayes, resulting in the birth of the twins' mother and Bertha's expulsion from the nobility.
eD9D TIL that there was an Order of Temperance in the Middle Ages; members pledged to drink no more than 7 glasses of wine with each meal
P1JYG TIL "Up in the Air, Junior Birdmen" wasn't just a nonsense ditty but was the theme song of a national organization started by the Hearst newspaper chain, and had 578,000 members at it peak in 1937
vPv5R TIL only one person has visited all 193 UN-recognized countries, as well as space. His name is Jim Kitchen.
WknX TIL in 1970 a disgruntled postgraduate student deliberately infected his roommates with Ascaris suum, a parasitic nematode. This was the first documented human infection by this species.