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TIL Refracting telescopes use the original telescope design by Galileo, with two lenses in a hollow tube. They can provide a crystal clear image for observing close celestial objects like moon and planets but not good for for deep sky objects, unlike reflector telescopes

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QJYKL TIL the Graf Zeppelin was the first airship to offer commercial transatlantic flights, to cross the Pacific without stops, to circumnavigate the world, and to travel over a million miles.
aNQZ TIL That Burger King was forced to change its whole franchise name to Hungry Jack’s in Australia due to a small takeaway joint already trademarking the name in Adelaide.
NvrN TIL In 1959, Volvo invented the 3-point seat belt, then gave free license to all other car manufacturers to use it. [x-post from r/Autos]
kJ6Xd TIL that Happy Days producers intentionally sought a short actor to play Fonzie. They didn't want his character to overshadow the rest of the cast who were all under 6 feet tall.Despite their intent, Henry Winkler (5' 6") still became the breakout star.
167XX TIL Horses in herds will often have a “guard horse” stand watch while others lay down to sleep