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TIL there’s a series of 70-foot-long concrete arrows that bisects the country longitudinally all the way from SF to NYC, all designed to direct aerial traffic. They are from the pre-digital age and were installed by the Federal government in 1924, coupled with light signals to guide the way.

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D17OY TIL the guitars on the 1983 David Bowie song "Modern Love" were played by Texas bluesman Stevie Ray Vaughan and funk guitarist Nile Rogers of the dance band Chic.
OG4jX TIL that Sara Blakely, founder of Spanx, bombed the LSAT, was rejected from the role of Goofy at Disney World, and was stuck selling fax machines for a living. She was named the youngest female self-made billionaire in 2012.
OEde TIL in 1994, the Surgeon General of the U.S. was fired for saying masturbation is “part of human sexuality, and perhaps should be taught.”
KOG8J TIL A tablespoonful of neutron star placed on Earth's surface would weigh as much as Mount Everest (whereas a tablespoonful of the Sun would weigh about 5 pounds). If the neutron star sample suddenly appeared on Earth, it would cause a giant explosion, vaporizing a good chunk of our planet with it.
nW4Ed TIL that in addition to Red Cross organizations, there are also Red Crescent and Red Crystal organizations, with the symbols localized for acceptance by the community of each nation that has such an organization. In the past there was also a Red Lion and Sun (Iran).