Here's a piece of limestone.

After the limestone rocks, what?

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

Those white cliffs are a dense Cambrian limestone.

And it's just limestone, nothing really special about it.

Would it give this block of limestone new properties?

The core comes up as these cylindrical tubes of limestone.

And it's different than this limestone, you can see that.

And that's not snow that's what the white limestone looks like.

Now a block of limestone, in itself, isn't particularly that interesting.

We don't just want limestone dumped everywhere in all the pretty canals.

On the trail we took just before we reached the limestone rocks.

I headed up hill just past the big limestone rocks we saw that Sunday.

So it would all be built in stone, in French limestone, except for this metal piece.

And Lost City was characterized by these incredible limestone formations and upside down pools. Look at that.

And so here the protocells are depositing their limestone very specifically, around the foundations of Venice, effectively petrifying it.

But gradually, as the buildings are repaired, we will see the accretion of a limestone reef beneath the city.

But imagine what the properties of this limestone block might be if the surfaces were actually in conversation with the atmosphere.

Ray It was Crease Limestone, and that was produced by sea creatures 350 million years ago in a nice, warm, sunny atmosphere.

The Kalahari Desert in the east and north is characterised by thick layers of the terrestrial land and limestone and scarcity rainfall.

And if you look even closer, you'll see, in that limestone, there are little shells and little skeletons that are piled upon each other.

That's natural. Natural?

Coal and natural gas are natural fuels.

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 all natural. This is all natural.

He's a natural leader, natural in the boats.

I love how they were able to preserve most in everything that makes you feel close to nature butterflies, man made forests, limestone caves and hey, even a huge python.

Qasr Al Hayr East The Umayyad limestone castle of Qasr Al Hayr East is in an isolated location in the middle of the Syrian Badia, 100 kilometres northeast of Palmyra.

Natural

Natural

Natural

Natural

Natural?

Belief is natural disbelief, skepticism, science, is not natural.

You leave aside what is natural to be natural.

Natural persons

It's natural.

Natural size

Natural log

Natural phenomena

Natural increase

Natural calamity.

Natural excavations

Perfectly natural.

Very natural.