How To Sharpen Any Knife -- Gizmodo
A sharp knife isn't just sharper, it's a safer, more efficient, more precise tool. And, like most people, your knives are probably dull. Here's how to fix that quickly, easily and cheaply.
Why do you need to sharpen knives? A sharp knife stands less chance of slipping on the material being cut and, because it requires less effort and force to use than a dull knife, you're less likely to cut yourself. Working with a sharp knife is faster and easier, too. It also damages the material being cut less — ever tried to slice a tomato with a dull knife? It doesn't exactly produce clean results.
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My Comment: For those who love to cook .... a sharp knife is essential. This is a good summary on how to have one.