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TIL that after the attack on Pearl Harbor, the U.S. government was worried Japan would invade Hawaii and seize all the U.S. currency there. As a precaution, the U.S. burned $200 million in cash circulating on the islands, and replaced them with freshly printed bills with “Hawaii” stamped on them.

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p8GOQ TIL of Carl Linnaeus, the father of modern taxonomy. His remains are the type specimen for Homo Sapiens. If any human evolves to such a point as to where they can no longer be described as being the same species as Carl's remains, they will no longer count as Homo Sapiens and will be a new species.
ywna TIL Ernesto Miranda, of “Miranda Rights” fame, was stabbed to death at a bar in 1976. A suspect was arrested but he exercised his Miranda Rights and was released.
W7GJ8 TIL that 'The Most Dangerous Animal in the World' was a 1963 exhibit at the Bronx Zoo. It featured a mirror and text describing the dangers humans pose to life on earth.
RnEQ TIL Thomas Edison did not invent the first electric light bulb, but rather became partners with Joseph Wilson Swan who had already developed & patented a working light bulb and Edison just bought him and his patent out. He was a brilliant business man and also kind of a dick.
b64Dp TIL that the first alarm clock could only ring at 4 a.m. It was created in 1787 by Levi Hutchins in Concord, New Hampshire. This device he made only for himself, however, and it only rang at 4 am, in order to wake him for his job.