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TIL metal tube invented in 1732 is what measures the speed of supersonic jets (and any other airplane, boat, or even F1 car). Called a pitot tube, it measures airspeed by measuring air pressure. More information at the link.

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9KZr TIL of a Japanese air ace who was shot in the face during a dogfight. Blind in one eye and part paralysed, “he flew upside down to prevent blood from blinding his other eye”, flew 5 hours back to base, made his report and then had surgery without anasthesia.
QZmX TIL that in January of this year, scientists in Antarctica discovered fish and other aquatic animals living in a subglacial lake, beneath a roof of ice 740 meters thick.
L0bv TIL that student loan debt is the largest form of consumer debt outside mortgages, and it now stands at 1.1 Trillion
Wkx0N TIL Psychologists are interested in magicians because they've been doing experiments for centuries and built a lot of techniques. Tricks rely on manipulating expectations, misdirecting, and can influence decision-making – all things that intrigue psychologists.
kbGd TIL “RMS Titanic” fired 8 emergency flares before sinking. A ship in the area, the “SS Californian”, saw the flares and that the ship appeared uneven in the water. The crew told the captain, who did not believe the rockets were fired in distress. All of Titanic’s passengers could have been rescued.