Electrodynamic bearing

An electrodynamic bearing is like magic! It's a special type of bearing that doesn't touch anything, but still holds something up. It's kind of like how you can hold a balloon up in the air without touching it.

The way it works is by using magnets and electricity. You see, magnets can push or pull each other depending on how they're positioned. And if you move a magnet near a wire, it can create electricity in the wire.

So imagine you have a spinning wheel and you want to hold it up without touching it. You could put some magnets on the bottom of the wheel and some more magnets on a plate underneath it. Then, you could use electricity to make the magnets on the plate push away from the magnets on the wheel. This would create a small gap between the two, but the wheel would still stay in place because the magnets are keeping it from falling.

It's kind of like magic, but really it's just science! And electrodynamic bearings are used in all kinds of things - from hard drives in computers to big machines that make things in factories. Pretty cool, huh?