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ANGGl
TIL that the 800 number system for toll-free calling, invented in the US, now exists around the world. Many countries have toll-free phone numbers that start with "800", "0800", "1800", etc. There is also a +800 country code for international toll-free calling, but not all countries participate.
b6yyp
TIL that the Manhattan Project produced a short book on how to build an atomic bomb. "The Los Alamos Primer" is 24 pages and completely declassified. Freeman Dyson wrote that the guide should not have been published, because it tells readers that "bomb designing is fun".
m1jjv
TIL the infamous "Jump the Shark" episode of Happy Days (Season 5, Episode 3) was created as a way to showcase Henry Winkler's real-life water skiing skills. The episode drew over 30 million viewers.