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TIL of the $23 million dollar toilets designed by NASA for deep space missions. With odor control being a serious issue, NASA pays certified sniffers to smell the toilets after they've been used to evaluate odor-control measures. The lead engineer calls them the "unsung heroes of the space program".

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W7Bk8 TIL of Lady Mondegreen - a mishearing or misinterpretation of a phrase in a way that gives it a new meaning. An example would be Jimi Hendrix's song "Purple Haze", where many, instead of the line "kiss the sky" mishear Jimi singing "kiss this guy"
oWR8 TIL Sweden has the largest scale model of the solar system in the world. It is in the scale of 1:20 million and streches 950 km across the country.
X0OmP TIL that the British once tried to destroy an entire island after WW2 because they didn't want it to be used as a fleet base for the Germans. This was done in "Operation Big Bang" where they detonated 6700 tonnes of explosives, which is considered one of the largest single explosive detonation.
GRX4 TIL the familiar ‘valentine’ logo at the beginning and ending of 'I Love Lucy’ wasn’t added until the show went into syndication. The show was originally sponsored by Philip Morris, and began with Lucy and Ricky dancing around a huge pack of cigarettes.
gMM78 TIL that the creators of Scooby-Doo, The Jetsons, & The Flintstones offered Jack Nicholson a job as an animator when he was 17 years old. He turned them down.