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TIL a predominant cause of jet lag is the lack of available oxygen in airplane cabins. Airlines only pressurize cabins to levels equivalent to 8000 ft. above sea level to extend the lifespan of the plane.

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W7j1Y TIL the duodenum acts as a degustator, food taster or sommelier, it receives a sample of the digested food in the form of chyme, for test, it analyses macro/micro nutrients, and gives signals for a specialised concoction of bile acids to be released. Once it give the green light, digestion proceeds.
kO1OE TIL it’s estimated that about 85 percent of hospitals still rely on pagers for communication.
neeRP TIL that conductors of Stanford prison experiment and Milgram experiment knew each other personally. Philip Zimbardo and Stanley Milgram were classmates in their senior year at James Monroe High School.
b9MA0 TIL that in some sign languages, signers use their mouth to create visual syllables in combination with their hands to create signs.(Mouthing)
Z809a TIL that the song Africa by Toto has a sound installation that was set up in an undisclosed location in the Namib Desert to play the song on a constant loop. That installation is powered by solar batteries, allowing the song to be played indefinitely.