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TIL that it's actually illegal for companies like FedEx to ship "non-urgent" letters unless the customer pays at least six times the value of USPS postage.

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E187o TIL that the Department of Energy will warn future humans 10,000 years from now about the presence of buried nuclear waste in New Mexico with 32 25-foot granite pillars. The pillars will be engraved with pictograms and warnings in many languages, along with buried magnets and radar reflectors.
16k1W TIL that Kuboyama Aikichi, a Japanese fisherman, was the first known victim of hydrogen bomb radiation exposure. He was aboard the "Lucky Dragon No. 5" (Daigo Fukuryu Maru), a fishing boat caught in radioactive fallout from the 1954 U.S. Castle Bravo hydrogen bomb test near Bikini Atoll.
vPvlK TIL that in 1986, the Rodney Dangerfield comedy "Back to School" was a bigger US box office hit than "Aliens".
GYGO7 TIL that since 2015 the International Space Station has a custom made Zero-G Espresso machine jointly developed by Lavazza and the Italian Space Agency. It's called the "ISSpresso" and produces Espresso in pouches which can then be consumed with a special Zero-G espresso cup.
JY7eV TIL about Impostor syndrome, a psychological pattern in which an individual doubts their accomplishments and has a persistent internalized fear of being exposed as a "fraud".Those experiencing this phenomenon remain convinced that they are frauds, and and do not deserve all they have achieved.