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TIL that Graf Zeppelin, the first zeppelin to cross the Atlantic, devoted about 30% of its total gas volume to non-lifting synthetic gas. It was used as fuel in combination with diesel to power the dirigible.

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8a6X4 TIL the novelization of "Pretty In Pink" doesn't change the original ending John Hughes intended for, where Molly Ringwald's character falls for and get together with Duckie, played by Jon Cryer
Vbam TIL that Apple used to add the letter “x” to the names of their computers which got a processor upgrade. The convention was broken with Macintosh SE/30, which, if the rule was effective, would be called “Macintosh SEx.”
grjgA TIL that after Goathe's novel "Sorrows of Young Werther" was published there was a marked increase in young men shooting themselves in the head while dressed as Werther was when he did the same thing.
7rgp7 TIL an Australian man was working as a hairdresser when he had the idea to make 3D printed prosthetic limbs from recycled shampoo and conditioner bottles. Working with 38 salons in Queensland, he is now testing the limbs with two children who had no access to practical and inexpensive prosthetics.
JRyQ TIL that the Earth’s population has doubled in the last 44 years, from ~3.5B to ~7B.