Millions of people sharpen their tools by grinding them on a round wheel. This isn't a new idea; grinding wheels have been used for centuries. However, as often happens on the internet, it has become trendy to overanalyze and pick apart long-held beliefs, claiming that everyone has been doing it wrong. I’ve heard many people argue that an edge sharpened on a grinding wheel will become brittle or dull more quickly than one sharpened on a flat stone.