The devices that computers use are what's called a transistor.

Volta's battery works at room temperature.

This is where the supply of current flows out from, you see?

That's a little better. Woman That side is better.

And his thoughts made him reach for Katie.

This electrode here, called the gate, controls the flow of current from the source to the drain these two electrodes.

It's no more than an anode and a cathode separated by an electrolyte, right?

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And this forces magnesium to de alloy and return to the upper electrode, restoring the initial constitution of the battery.

We can now reach those circuits.

Your electrodes came off last night.

And that current, electrical current, is carried by electrons, just like in your house and so on.

So this is what we did.

One part of the virus grabs a carbon nanotube, the other part of the virus has a sequence that can grow an electrode material for a battery, and then it wires itself to the current collector.

like the one that you can see here in the photo.

This is work done with my colleague Helen Mayberg from Emory.

I've got a real estate problem.

They put electrodes or sensors on my head.

Miss baum's electrodes must have slipped off again.

This is the starting point for designing a battery two electrodes, in this case metals of different composition, and an electrolyte, in this case salt dissolved in water.

So this looks something like this.

This is the place where the meditators you can see it's kind of inspiring.

I'll be back later to attach your electrodes.

And what you have here is, when you actually turn on the gate, you get an increase in the amount of current, and you get a steady flow of current.

Data powers high tech societies.

In the 1950s,

I have a stake in these, so I'll have a disclaimer there.

Telephone. Electricity.

And we sent it off, and by return mail it came back.

That's a generator.

We stimulate one place, the other place. We can stimulate lots of places.

Power plant.

What a pleasure, nice to see you. Call me.

The lights are out in these areas of the brain.

And here we can see him getting the therapy.

And this is one of the ways you can study play is to get a 256 lead electroencephalogram.

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Cutie current under tension is...

Yes, I was accumulating data.

And to power this, you'll need some kind of battery to connect them.

Every time you contract a muscle, it emits a little electricity that you can record with antennae or electrodes and use that to operate the motorized prosthesis.

Now they know what part of the brain they can remove in order to cure the patient.

Wires carry electricity.

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And we've all heard of charge.