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TIL the United States Airforce provides the use of GPS signals free of charge to the entire world.

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VBmpZ TIL: the design of the 'Single Leaf' Flag of Canada was designed and implemented as recently as 1964
YpPNZ TIL that the longest unbroken treaty relationship in U.S. history is with Morocco, with whom a treaty of peace and friendship was renegotiated in 1836, and remains in force today
KY89B TIL that the genetic traits that helped people survive the Black Death in the 14th century are linked to autoimmune diseases like Crohn's disease today, showing how a historical pandemic shaped the evolution of human immunity genes.
d8lRQ TIL that when he was assassinated, Martin Luther King Jr. had a nearly 75% public disapproval rate
gMGd8 TIL that Burying the dead has been illegal in San Francisco since 1901. Because space was limited and real estate at a premium even back then, the city outlawed burials and moved all cemeteries to neighboring Colma, CA.