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Razors may start sharp, but even though they only cut soft hair, they become dull surprisingly quickly. Now we know why blades that cut soft materials lose their edges so easily, which should help researchers design longer-lasting blades for knives and razors.

“We are all familiar with the problem with razor blades: you use them, they work for a short while and then they are not so good any more,” says Cem Tasan at the Massachusetts Institute of Technology. “You have a blade made of steel and then it touches human hair, which is obviously a much softer material, but the blade somehow deforms.”

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