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TIL the helicopter used during the US operation that killed Osama Bin Laden in 2011 that crashed was a stealth helicopter that was never known to publicly exist before

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kJlE5 TIL the BBC programme "The Black and White Minstrel Show," with white actors performing in blackface, aired for 20 years ending in 1978. Once, in 1967, as an experiment, the network aired a version where black actors performed in whiteface.
nGGr TIL Real-time (to the day) drug use in urban areas can be monitored through sampling the sewage.
RW81 TIL the White House grounds were open to the public until 1890, when the first lady ordered the grounds closed because she was creeped out by tourists fussing over her baby.
wLjKY TIL that America has an infrastructure grade of a D. Records report that the grade hasn’t changed since 2013 but hopes to see improvements by 2025
YpWOB TIL Korea's Royal Palace was burnt down during the 1592 Japanese invasions and left in ruins for over 250 years. It was rebuilt in the 1860s but later destroyed by Japan to build the colonial government building in its place. As of now, work has been ongoing for over 4 decades to restore the site.