Why does broken glass seem to be the sharpest thing on the planet? Even the smallest piece can stick in your foot and cause the worst discomfort. Is anything sharper than broken glass?
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Plenty of things are sharper than broken glass. Glass is sharp because it *doesn’t* bend. A metal edge is soft so it can [roll or blunt](https://qph.cf2.quoracdn.net/main-qimg-e329f114bb9ad9a52f45f6029aa4c64c.webp) as force is applied to the steel. Glass is very *hard*. That’s what makes it so brittle. It will *not* bend, so it shatters instead.
When it does shatter, it breaks along shear lines that leave those sharp edges. Something like metal will [bend as it breaks](https://makeagif.com/gif/tensile-testing-a-stainless-steel-tensile-specimen-hOWxdm) so there isn’t a clean break line.
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