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There's a better way to slice a round cake than the traditional wedge especially if you plan on saving some for later. In the following video, mathematician Alex Bellos, citing a century-old article in the scientific journal Nature, demonstrates a different strategy. Basically, he cuts a rectangular piece from the center and pushes the remaining pieces back together. According to Bellos, this technique will keep your cake moist and spongey for days. Imagine: a birthday that lasts all week! Watch: