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TIL the Bruce effect, or pregnancy block, is the tendency for female rodents to terminate their pregnancies following exposure to the scent of an unfamiliar male. The effect was first noted in 1959 by Hilda M. Bruce and has primarily been studied in laboratory mice.

wor7J TIL the common paperclip is considered a national symbol of Norway because many believe it was invented there. In fact, Johan Vaaler invented a different kind of paperclip that is impractical and was never used.
9oxm TIL of the term OOPart (Out-of-place artifact) which refers to an artifact of historical, archaeological, or paleontological interest found in an unusual context, that challenges conventional historical chronology by being “too advanced” for the level of civilization that existed at the time.
QJ0De TIL Orson Welles War of the Worlds radio broadcast wasn't widely believed but was remade for Ecuador where it mobilized police and military. When the hoax was uncovered a mob burned down the radio station, tragically killing 6 employees that may not have even known it was happening.
OoJDL TIL that Japanese scientists had cultivated enough CowPox to infect all the people in the United States and were ready to deploy it via ocean crossing balloons which had already delivered bombs but Emperor Hirohito did not permit it.
ADNVx TIL that Wayne Gretzky was so dominant in Fantasy Hockey, that many leagues split his stats into two players: Gretzky (Goals) and Gretzky (Assists)