› added 2 years ago

85

TIL Although an ace is usually associated with a pilot, there are also aces in the combat of tanks and submarines.

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p8MeN TIL: Popup headlights were actually invented in the '30s. They came back in the 80's when auto manufacture needed a way to skirt minimum headlight height safety laws, and fell back out of fashion again due to modern regulations concerning headlights being on movable body work.
1aXMr TIL of Betty Ong, a flight attendant aboard American Airlines Flight 11. Ong notified the American Airlines ground crew of the hijacking, staying on the telephone for 25 minutes and relaying vital information that eventually led to the closing of airspace by the FAA for the first time in history.
bjZa TIL that Andy Warhol would go into hair salons to get his wig cut, then the next month he would come back to the salon in a longer wig and act like his wig had grown.
xVneD TIL why radar side lobes are detrimental to radar accuracy. They allow echos and jamming to be received by the radar antenna despite the fact they do not come from the direction the antenna is pointed to. Once received, there is no simple way of distinguishing them from the wanted signals.
4O5a TIL that in 1973, a study asked doctors to pick out healthy people sent to a psych ward by the researches. Doctors suspected 84 people of being healthy. The researchers actually never sent the healthy people. This led to fundamental doubt of the validity of modern psychological evaluation.