They've gone underground.

Kill 'em all.

Eat them all!

At the end of their lives, they're going around each other very near the speed of light.

Evidently there's a shift in their spectrum.

And the cool thing about fluorescence is that it's not only bright, it actually can shine through tissue.

If you put electricity on them, they emit light.

Moving all the time, they were the rays of the sun, or leaves in the wind, or red toys hanging from the ceiling, or, perhaps, faces with dark eyes or nurses in white dresses.

So, this used to be completely smooth.

We call it, in fact, a Li Fi, light fidelity.

We were using it at lunch today in the sunlight, and the more sunlight the better.

They like to sunbathe, can't blame them.

You see the red glow in their eyes, which is the reflection of the flashlight.

They don't need the sun at all.

The protocells can actually move away from the light.

When you shine light on them, you can see them bubbling.

They're smaller than a wavelength of light, so we have no way to directly observe them.

What we do is we evolve it in a box with a light on.

The sun'II bring 'em back to life!

And they use light to illuminate space down there.

It's got light organs in the mouth, it's got light organs in every single scale, in the fins, in a mucus layer on the back and the belly, all used for different things some of which we know about, some of which we don't.

They can actually also move towards the light. You have to just choose your species.

They've got those black sinister eyes and those spots on their body.

It's actually a light sensing organ.

But they won't come to us directly through light.

The light we bring to it and leave behind in words.

In the opinion of Deadwood City, there ain't no other opinion.

They flash, and sparkle, and glow with their own living light.

If you shine a light on them, they produce electricity.

And there are brittle stars that produce bands of light that dance along their arms.

What would economies look like if we took that vision of human nature at their heart and stretched them along these orthogonal dimensions of the human psyche?

Their eyes have three lenses, three pupils. Strong light shocks them.

You take a glow gene out of a coral or a jellyfish and you stick it in a zebrafish, and, puff, they glow.

It's got light organs on its belly that are flashing, fin lights.

With the sub's lights switched off, it is possible to see their bioluminescence the light produced when they collide with the mesh.

So, initially nothing happens, they're just flipping around there.

Next we can actually light them up with a laser.

It grew as light and oxygen increased.

It's sort of funny dancing lights, shown there on the left and right side.

It's light, and light has been around for many millions of years.

So in this cartoon, the bluish white cell in the upper left corner does not respond to light because it lacks the light activated pore.

Now, let's see the surfaces according to the quality of light that they reflect.

When there's a lot of chlorophyll around, they see a lot of green light.

Don't you worry, that your trees will grow right up into the sky? No, never.

It actually uses the light from the bacteria to counter illuminate itself in an anti predation device so predators can't see its shadow, calculate its trajectory, and eat it.