The World's Sharpest Blade Revealed

What’s the sharpest thing in the world? Now you might think it’d be something like a katana.

But you’d be wrong. Turns out the actual sharpest blade ever discovered is from 700,00 years ago.

And here’s what most people think is the sharpest: a super sharp chef’s knife.

And while that’s probably the sharpest thing in your house, its edge is 4,000 atoms thick.

Now for caparison, a really thin human hair is 100,000 atoms thick. Now for the sharpest

blade in any hospital, we have the surgical scalpel. With an edge of 2,000 atoms thick,

it’s twice as sharp as a kitchen knife. And now for the sharpest blade in the known world,

we have obsidian. Volcanic glass that forms when lava cools really fast. And its edge is