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TIL: American inventor William Richardson created an enhanced swimming apparatus around 1880, enabling users to reach speeds between 4 and 6 miles per hour. The device utilized a central longitudinal shaft to transfer cranking movements of hands and feet to a four-bladed propeller.

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Wkdp8 TIL that Jon Favreau was the Clown from Seinfeld that didn't know who Bozo was.
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rN4Qx TIL that the first use of an external defibrillator was on a 14-year-old boy in 1947. These early defibrillators used alternating current that was transformed from 110–240 volts available in the line, up to between 300 and 1000 volts, to the exposed heart by way of "paddle" type electrodes.
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