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TIL of the Demon Core, a spherical mass of plutonium that killed and injured several scientists during criticality experiments

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Y7eWP TIL about the Diomede Islands - Big Diomede is in Russian territory, Little Diomede is in the U.S. They're just 2 miles apart, but due to the International Date Line, Big Diomede is 21 hours ahead of Little Diomede.
kwYg TIL The alleged last surviving veteran of the American Revolutionary War also had the longest recorded marriage at 91 years, 12 days: The only documented marriage to have broken the 90-year anniversary mark.
YpdRG TIL that, in the American West of the 1800s, up to one in four Texan cowboys was African American. The number of Mexican cowboys was even greater.
d8rkB TIL About Antonio Meucci, a poor inventor who created a working prototype of a telephone years before Alexander Graham Bell, but lost his patent due to not being able to pay a ten dollar fee to keep the caveat.
x6jk0 TIL In 1930, Bernard Lyot invented the coronagraph that allowed total solar eclipses to be recreated at will. It is essentially a telescope with a small disk in the focal plane to exactly cover the disk of the sun like the moon would