lasers, portable X Rays, shielding for nuclear reactors, compact discs, hybrid vehicle motors,

But the pay off is really enormous.

And I have 100 of them.

That's a third of the U.S. population.

Spherical light after explosion

But on the other hand, we have 14 billion of these

The GlowintheDark Flashlight!

40 Watt incandescent lamp

100 Watt incandescent lamp

200 Watt incandescent lamp

No, your flashlight is meant to illuminate.

For us, we're very facile around electricity.

The light bulb has burned out.

Now, think about where the world would be today if we had the light bulb, but you couldn't focus light if when you turned one on it just went wherever it wanted to.

So I have one light bulb there.

I'm going to number them one through 100.

But I think you get the point.

So what's our question?

Here are the cables coming up into this light fixture.

As you might guess doing so would take a huge amount computation for even the most modest scene.

And let's say there is a certain amount of sunlight that is reaching the Earht.

36, 49, 64, 81, and 100.

This is coal, the most common source of electricity on the planet, and there's enough energy in this coal to light this bulb for more than a year.

A little bit of differential, but not much.

The response to a bad idea

Well, let me actually just draw them.

So the first light bulb is light bulb one.

The fifth light bulb would have been on and it'll stay on.

So the first pass, I switch every light bulb.

Four times four is 16.

I think the most promising way is to go for biomarkers.

I love renewables. But I'm also pro arithmetic. (Laughter)

light bulbs, light.

Or I could say, I know that I'm going to switch light bulb 51, because 17 is a factor of 51.

So for example, if we're looking at light bulb eight.

I've been quite interested in both.

(Laughter)

The GlowintheDark Flashlight!

Light bulb two will be off.

I ran like lightning.

I ran as fast as lightning.

China leads their explosive growth and their plummeting cost.

Edison invented the light bulb.

The light is out.

You know, this type of bulbs produces a lot of heat.