Illustration for article titled The cutting edge of a knife is totally invisible to the naked eye

That's a red blood cell on top of a knife's cutting edge. Now, we know we can't see a red blood cell with our naked eyes. It's too tiny. But we think we can see the cutting edge of a knife because it's there in front of you, right? No, you can't see it. To your eye, it's invisible, as Nikola Slavkovic explains in this video.

I hate science sometimes.

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