We've seen ultrasonic cutters before, for craft applications. These are basically powered X-Acto knives that use ultrasonic vibrations to do the cutting for you.
Now the technology has been applied to kitchen knives. A startup called Seattle Ultrasonics has developed this C-200 Ultrasonic 8" Chef's Knife.
When you hit the button on the handle, the blade vibrates—imperceptibly and inaudibly—and cleanly slices through food. It can even be used as a bread knife.

And yes, the housing is waterproof.
The knife runs $400. It has a USB-C port for charging, you supply the cable. But if you'd like to spend more, for $500 you can get both the knife and this wireless charging tile.


I do all my own cooking, and I'd never buy one of these; learning to properly sharpen a kitchen knife isn't that difficult. That said, our gadget-crazed culture will probably go nuts for this thing, and I expect it to sell like hotcakes.
The company is taking pre-orders now and expects to ship in January. Here's the pitch:
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I can see this being really handy for someone with a disability.
Looks like some ER grade sharpness.