If by "Of All Time" we are talking about the totality of human history, then I think we need to look back a bit further.
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And that only counts for people who had access to flint and obsidian. Lots of cultures had to rely on mussel shells, bones, teeth, and reeds as their only cutting instruments.
**Edit to add: If we're going to focus on the "Greatest" aspect, then I'm sure we can agree that steel knives supersede any made with stone or other natural materials. In which case I think it's fair to suggest that simple designs for working knives like these probably dominated for much of history and in many cases still do.
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These above are some Norse artifacts, but some of the designs share a striking resemblance to this much older bronze knife from Greece.
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