Dr. Eric Haseltine

But in NASA's program, they look at a lot of things from laser propulsion in space, light sails.

And they also look at fusion reactors where you basically create a fusion reaction and you spew gamma rays out the back.

And again, it's photon pressure.

A photon doesn't have any mass, but it has momentum.

So when a photon hits something, it imparts its momentum to it and it will move it, right?

And so I think that to me, those are some of the more interesting, but there are some other really weird ones like magnetic levitation, right?

For example, did you know it's possible for me to levitate you with a super strong magnet?

Levitate me.

Yeah.

No, I didn't know that.

But we've done it with birds and frogs and spiders.

What?

Yeah.

And here's the way it works.

Magnetism isn't just what you think of as a, like a piece of iron or a rare earth magnet or something like that.

It's what we call ferromagnetism.

There are a zillion other kinds of magnetism.

There's ferrimagnetism.

There's diamagnetism.

There's paramagnetism.