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TIL The United States once had "Dynamite Guns" guarding San Francisco. Giant compressed air guns fired hundreds of pounds of Dynamite at enemy ships. They were retired once more stable explosive charges were invented.

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jNRQ TIL that thousands of high school students watch 12 minutes of Channel One every day of class: A multimillion-dollar, corporate-owned program that pipes advertisements into the classroom. In return, participating schools receive technological grants.
0eeR TIL in “Bill and Ted’s Excellent Adventure” the time machine was to be a 1969 Chevrolet van. The idea was abandoned because it was too similar to the DeLorean used in “Back to the Future”. A telephone booth was eventually used despite it’s similarities to “Dr. Who”.
71Lr TIL - There is an annual man vs. horse marathon in Wales, and humans have won it twice.
pPWG TIL that breast cancer is one of the most survivable cancers over a five year period
n7xP TIL Martin Luther King’s “I have a dream” speech is owned by CBS and it is illegal to distribute it