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TIL Earth's magnetic field was approximately twice as strong in Roman times as it is now

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v1WD7 TIL the turning point that pushed Boston to dig under its streets and open America’s first subway on September 1, 1897, was Frank Sprague’s invention, the Dynamo Electric Machine.
a87OL TIL James West in 1962 invented the transducer microphone. His invention accounts for 90% of all microphones sold today. He also had over 250 patents to his name.
jNyNa TIL that St. Valentine the saint of romantics and lovers is also the patron saint of epilepsy.
7LBZ TIL Sam Worthington was broke and living in his car when he landed the lead role of Jake Sully in Avatar
GYNv1 TIL in 1993 David Letterman cut Bill Hicks final Late Show standup appearance for being too controversial, 4 months before he died. To make amends in 2009 David invited Bill's mother Mary as a guest & broadcast the full routine. David remarked "It says more about me as a guy than it says about Bill"