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Comment by hvna | Hacker News Reader

I think "sharpest" may be a bit of an exaggeration in the title. While the technique is cool and I recommend watching more of this guy's videos, it's by no means the sharpest knife. I have a small business hand sharpening knifes using a similar technique (Japanese ceramic whetstones and hones) and I can easily make one much sharper within a few minutes. It's a great hobby and a good way to make some side cash if you learn your stuff.

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You have a business where you regularly seperate beach sand into its components and make a knife out of it and sharpen them?

The claim here is not that this is the sharpest knife ever and it just happens to be created in a home lab using sand and a microwave. The claim is that among all knifes made from sand, using a microwave, this one is the sharpest - and I am not convinced that you have such a knife, let alone one that is also sharper.

To be fair, the title is ambiguous.

But are any of your knives made from sand cooked in a microwave?

My understanding is that the claim is sharpest knife that was made in that fashion, not sharpest overall knife.

Yeah, I don't understand why anyone would nuke beach sand when coffee can carbon foam furnaces are trivial to make.

And in about 2 seconds, I can get a really damn sharp "knife" by dropping a wine glass on the floor to induce conchoidal chipping. My foot and hand can attest to them being as sharp or sharper than any surgical instrument or Japanese-angle ground knife.

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