{"product_id":"the-dancing-disc","title":"The Dancing Disc Kit","description":"\u003cp\u003e\u003cspan\u003eThis fascinating physics demonstration mesmerises everyone that sees it. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 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 very long. The Dancing Disc, by contrast, spins for a long time before coming to rest. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe steel disc weighs 450 grams, and can easily be made to spin for a minute and a half or even longer! The best thing really is to watch the video. It is a lot of fun showing this to someone who has not seen it before - the fact that it spins for so long is surprising, as is the ending. The ending is not only spectacular, it also has a spectacular name - a finite-time singularity!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe kit requires some construction in order to complete the base. \u003c\/p\u003e\n\u003cp\u003eThe kit includes: cardboard parts for the mirror bezel, 2 brass foil stickers for the disk\u003c\/p\u003e\n\u003cp\u003eDisc diameter: 7.5 cm\u003cbr\u003eDisc thickness: 1.3 cm\u003cbr\u003eDisc weight: 433 g\u003cbr\u003eMirror diameter: 20 cm\u003c\/p\u003e\n\u003cp\u003eThe mirror is made of glass, and therefore we recommend that it is suitable for Age 14+. It is suitable for younger children under supervision. This is not a toy. \u003c\/p\u003e\n\u003cp\u003eFor customers in North America, we suggest you buy this item instead - https:\/\/www.toysmith.com\/products\/eulers-disk\u003c\/p\u003e","brand":"Grand Illusions","offers":[{"title":"Default Title","offer_id":53020005073243,"sku":"1176","price":39.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/4018\/5947\/files\/the-dancing-disc1800x600.jpg?v=1779185604","url":"https:\/\/www.grand-illusions.com\/products\/the-dancing-disc","provider":"Grand Illusions","version":"1.0","type":"link"}