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SUBTITLES AVAILABLE Euler's Disc (Euler is pronounced 'Oiler') is a fascinating physics toy that mesmerises everyone that sees it. The base is a slightly concave mirror. There is then a heavy metal disc, which you place on the mirror, and spin. What happens then? Well, just like spinning a coin on a table, the disc both spins and rolls, until it comes to a sudden stop, the final stages being accompanied by a sound of increasing frequency. A coin spun on a table will not spin for all that long. Euler's Di
