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TIL the inventor of headphones was picked up by the US Navy after being rejected by private investors.

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0d7R TIL - Male mice sing an Ultrasonic “love ballads” as a means try and court female mice.
oBlLE TIL less than 7 percent of people have a negative blood type
P1aWg TIl that in 1995 comedian Lenny Henry created a live action Wallace And Gromit for a Christmas Special. It only aired once because viewers rightfully complained about how horrifying the characters looked.
a87B0 TIL that for several years Republican and Democratic states had differing dates for Thanksgiving.
mx9jP TIL That there are no A and B batteries because they simply quit selling as they didn't fit into the growing consumer electronics business needs after World War I