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TIL twins Grace and Virginia Kennedy (b. 1970) were often left alone with their German speaking grandmother as children and as a result developed their own secret language. They used it til they were about 8 when they were forbidden to by their father. They called each other "Poto" and "Cabengo".

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yP8v TIL of the Brabham formula 1 fan car. Fans were used to suck air out from under the car. Air-tight ‘hover-car like’ skirts allowed the fans to develop negative pressure beneath the chassis. This effectively allowed the car to 'stick to the road’. It won its only race before being banned.
yVoMp TIL that in 1946, Hungary issued the largest-denomination banknote ever, the 100 quintillion (10^20) pengő note. This was a result of the worst case of hyperinflation in history. One sextillion (10^21) pengő banknotes were printed as well but ultimately never issued.
VMGm0 TIL the Republic of Texas was just one of many secessionist movements in Mexico under the unitary government dominated by Santa Anna. Others include the Republic of the Rio Grande, the Republic of Zacatecas, and the Republic of Yucatán.
KYR8E TIL blood lost during a cycle isn’t blood that’s been “stored” over the month long cycle, it’s blood coming from blood vessels in the uterus. As the uterine lining pulls away, ‘tiny’ ruptures/tears are caused in the blood vessels, and heavy cycles are caused by enlarged vessels & hormone imbalance
dDWKK TIL that the word "hello" is younger than the United States. It was first attested to in writing in 1826.