Joseph Davidovits

So what's the theory? Let's get into it.

De Vinci was saying that if you take natural limestone or granite or desert sand or basically like stone, and you grind it down into more of a...

You don't actually need to do a powder.

That's something that was also contested.

He he put that in his paper that he believes that the ancient Egyptians were leaving some sort of.

nod to the fact that they created stones with minerals from the famine stealer.

And Joseph Davidovits, not only did he do the paper in the 1980s, I think he did other later papers as well.

He works with, or he is in charge of, the Institute of Geopolymer in France.