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TIL that both men and women laugh more at men than at women

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d8lAr TIL 1967 Malmstrom AFB UFO Incident - On 16 March 1967, a red-hued UFO singlehandedly disabled and cut off radio communications of the entire Malmstrom AFB filled with Minuteman Nuclear ICBMs.
x6Xy7 TIL while the fear that technological unemployment inevitably generates structural unemployment is known as the ‘Luddite Fallacy’, the Luddites themselves were actually put out of their jobs by new tech, and were brutally crushed when they revolted
NYoN TIL spiked dog collars made their first appearance in ancient Greece, designed to protect the dogs throats from wolf attacks
wngo TIL Even though oranges had been around in the UK since the 1300’s, the colour word “orange” wasn’t introduced until the 1540’s. Before then all orange coloured things were deemed to be red. Which is why the robin has a red breast, even though it’s clearly orange.
KYR96 TIL: Male echidnas have a four-headed penis — during mating, the heads on one side "shut down" and do not grow in size, while the other two are used to release semen. Each time it copulates, it alternates heads in sets of two. Prior to 2007, no one had ever seen an echidna ejaculate.