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The knives require a sharpened regular when they are facing tough tests against hard parts, such as occurs in a butcher shop. However, the razor blades are replaced routinely after cutting materials much more soft, and that they are usually made of stainless steel , well-sharpened, and coated with a layer of materials, even more hard, as the carbon of a diamond. How something so weak can deteriorate a sheet, a priori, much stronger?

Engineers MIT have studied the act of shaving closely, observing how a blade can be damaged when you cut out the human hair in spite of being 50 times more weak that the own blade. They discovered that the shaving deform a blade of