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TIL for each person that died on 9/11 the US has spent $1.6 Billion to fighting the War on Terror (5 Trillion divided by 3,000)

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KZm6 TIL that although lead paint was recognized as toxic as early as 1897 and banned by the League of Nations in 1922, the US did not ban lead paint until 1971.
OoAng TIL Viagra (sildenafil, the compound) was originally developed for the treatment of high blood pressure and chest pain due to heart disease. During the clinical trials, researchers discovered that the drug actually way more effective at inducing erections. In 1999, Pfizer sold 1bn$ worth of Viagra.
X9Ej TIL Eduardo Chibas, pre-revolution Cuban politician, shot himself dead on-air during his weekly radio show as a protest against the corrupt government. He didn’t realise his allotted time was only 25 minutes, and the gesture ended up happening during an advert break instead.
D1XAJ TIL Billy Redden, who played Lonnie in the famous Dueling Banjos scene from Deliverance, was paid only $500 for his role and now works at a Walmart in Clayton, GA.
aww7L TIL There exists a device that allows blind people "see" with their tongue.