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I often find that chopping things e.g. carrots can take a long time and be boring. My idea is a knife with, say about 8 blades coming out of it. It will have like a tee shaped handle and from the top of the tee will stem the blades. There will also be a wingnut for example to adjust the width that the knife cuts the chunks in so (depending on the width setting) it would be possible to cut a whole carrot in just two movements.