This Pi Day, try calculating everyone’s favourite mathematical constant using balls and a cardboard tube, thanks to a mathematical trick involving the balls’ masses
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https://www.newscientist.com/article/2237334-pi-day-how-to-calculate-pi-using-a-cardboard-tube-and-a-load-of-balls/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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