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TIL In December 1973, Johnny Carson made a joke about an upcoming toilet paper shortage... the talk show host’s joke was blamed for causing a nationwide toilet paper shopping spree

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v1x5K TIL that physicist Wallace Sabine was assigned the impossible task of fixing the sound quality of a poorly designed lecture hall. Despite having no background in acoustics, he discovered a relationship between chamber size, absorption surface and sound quality. Thus founding the field of acoustics.
QNEdL TIL that Harriet Tubman believed John Brown did more for the black Americans than Abraham Lincoln did.
7rwVX TIL the "r" in "Mrs" comes from the title of Mistress, as it was the counterpart of the title Master, which held the original abbreviation of "Mr".
kOv7W TIL the Copyright Term Extension Act (CTEA) of 1998 expires on New Years Day, 2019, finally allowing works to become part of public domain, starting with works published in 1923.
9w4jG TIL of the Tlatelolco massacre, a student protest that led to hundreds of deaths and thousands of people being injured, after the mexican government had snipers firing at the Mexican Armed Forces to make it appear the protest had turned violent and justify the massacre