The mathematics of multiblade razors

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The Economist has a short, tongue-in-cheek piece this week about the math behind the evolution of multiblade shaving systems. “For the most cynical shavers,” the piece says, “this evolution is mere marketing. Twin blades seemed plausible. Three were a bit unlikely. Four, ridiculous. And five seems beyond the pale. Few people, though, seem willing to bet that Gillette’s five-bladed Fusion is the end of the road for razor-blade escalation.” Apparently, adding extra blades is quite a technical challenge.

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