Maybe they could extract carbon dioxide.

Limestone pie and hot melted silver.

But after some nagging, I got him to do that.

It looks beautiful.

We're not killing the colony we're taking a small core sample out of the top.

Well, we have to take a little excursion, and we'll start in central Texas.

The first tunnels date back to 60 B.C.

They shouldn't be there. And we called it Lost City.

It's about 400 million years old.

The dip slopes in the overlying limestone, the orientation of the flora, shallow waters...

And then they are fossilized over millions of years.

Latin'calx 'for'lime'

Over on the eastern side it's gentle, as you can see.

It's important if you try to model this.

These slabs are sand stone, they half a ton each and they were smashed open from the inside .

I picked this up at MlT. It's a little younger.

The dead have been covered with lime.

So that these don't just exist as one entity, we kind of chemically engineer them.

According to the Roman scholar Pliny the Elder, citizens of the Empire believed that limestone from a quarry near Troy would dissolve flesh.

We're in Pole Canyon, looking west up the western escarpment of Mount Washington, which is 11,600 feet on top.

It's a stretch of beach we know so well.

There are huge walls buried under limestone plateau in the northeast of the Great Pyramid of Khufu.

We saw these alternations between sediments that look like this there's gravel and cobbles in there and a bunch of sand.

Some of those grains may then cement naturally into sandstone.

It peaks in early adolescence.

As rocks and mountains die, grains of sand are born.

You put the stick in the powder to take the sacred ashes well, they're not ashes, they're burnt limestone to empower the coca leaf, to change the pH of the mouth to facilitate the absorption of cocaine hydrochloride.

What we are going to be doing with that Rover as it drives around, it's going to go and analyze the chemical composition of rocks.

Now, this is the very interesting part.

It was then, after such hard work and many frustrating years that we found Selam, and you see the face here covered by sandstone.

Alberta. These are sulfur blocks.

And architect Christian Kerrigan has come up with a series of designs that show us how it may be possible to actually grow a limestone reef underneath the city.

This is our protocell technology, effectively making a shell, like its limestone forefathers, and depositing it in a very complex environment, against natural materials.

We call these slabs of the solid rock layer 'plates'.

So first of all, let's use our terminology.

You wouldn't build a building out of this stuff, and you wouldn't try to give a lecture and write on the chalkboard with this.

But also, if there is something that we cannot reach because it is too high on a cliff, we have a little laser system which will actually zap the rock, evaporate some of it, and actually analyze what's coming from that rock.

Ashes to ashes...

Ashes to ashes.

And here we actually found a decrease in gray matter.

We then pull the piles up through the dune and we're able to create almost any conceivable shape inside of the sand with the sand acting as a mold as we go up.

And whatever there is less of, so the more water is the solvent and in that case, that is the in this case, that is the sugar that is considered the solute. this is the solute, so the sugar.

And the amygdala is the fight or flight part of your brain.

In a desert plain in Tanzania, in the shadow of the volcano Ol Doinyo Lengai, there's a dune made of volcanic ash.

All of the assignments involve hands on activities, from creating an outfit for a rock person... gt gt Student