A lighter, kid-friendly challenge for July: cut a birthday cake into exactly eight pieces using only three straight cuts, without moving or rearranging any pieces between cuts.
(The classic answer: two vertical cuts, perpendicular to each other, give four pieces; one horizontal cut through the cake’s midplane then doubles that to eight. Bonus round for the curious: if the cake is a Bundt cake — with a hole through the middle — three straight cuts can actually yield 13 pieces.)
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