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TIL one of the first video games ever created Tennis for Two was made with an oscilloscope (a device for visualizing waveforms) in 1958 by physicist William Higinbotham. Players used a custom one knob, one button controller to try to hit a ball over a net.

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8aoMZ TIL in China, the per capita GDP rose from $89 in 1960 to $10,000 today. The life expectancy rose from 43.7 years in 1960 to nearly 80 years today. The country was producing two new billionaires per week in 2017.
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oBOK7 TIL that the image of actor Leo Gorcey was erased from the front cover of the Beatles album Sgt. Pepper's Lonely Heart Club Band because he asked for a fee.
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5YO1k TIL that during an experiment, chemist Karen Wetterhahn accidentally spilled two drops of organic mercury on her hand. That small amount of mercury would kill her in less than a year, despite her wearing gloves at the time and taking appropriate measures to clean herself up.