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TIL For a brief period in 1930 in the US you could purchase special postage stamps to have your letters delivered via zepplin

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PYDYJ TIL about the Pseudo-Geber corpus, a group of influential works on chemistry and alchemy from the 13th and 14th centuries, whose authors are unknown because they attributed them to the legendary alchemist Geber in an attempt to gain credibility.
xAA7 TIL that mathematician Paul Erdős published so many papers during his lifetime that there exists the Erdős number scale which measures the “collaborative distance” between Erdős and other mathematicians. Over 130,000 mathematicians have an Erdős number.
e09KD TIL that Arthur C. Clarke (served RAF there), Simon Pegg (studied there), Gordon Ramsay (moved there at age 9), and of course William Shakespeare (lived there) all were connected with the small locus of Stradford-Upon-Avon in England.
YrjW TIL the earliest known maps are of the stars, not the earth.
yQaZJ TIL that Alex Trebek and Jesse Ventura guest starred on an episode of the X-Files as The Men in Black.