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TIL that the "sweet spot" altitude for airplanes is between 35000 and 42000 feet - At higher altitude the air is too sparse for the engines while lower altitude means higher resistance

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lkjG TIL dolphin communication follows a linguistic rule that unites human languages, called Zipf’s law. The law states that the frequency of a language’s common words follow a trend — the most common word in a language appears twice as often as the second most common word.
D1V4v TIL of the Isdal Woman, who was found dead in Isdalen, Norway 1970. An autopsy revealed she had been poisoned with phenobarbital and carbon monoxide. Her death remains a mystery
dD7y9 TIL an autograph Beethoven manuscript was missing for 115 yrs until a librarian at a seminary in Philadelphia stumbled across it in 2005. It contains annotations by Beethoven which provide insight into his thought processes in the months before his death when he was deaf. It was sold for £1.1 milion
kOWgB TIL that archaeologists in India, found though carbon dating, a chariot that dates back to bronze age (Approx 4000 BC). This suggests that Europeans and Indo-Iranians were two separate groups (albeit of a common origin - Proto-Afroasiatic) and challenges the Aryan Invasion Theory
o0nr TIL that Ray Dolby (the “Dolby” on audio equipment) helped develop the first videotape recorder before the age of 21. After founding Dolby Laboratories, he became a billionaire by charging little for his technology so others paid him instead of developing their own.