'Is this not '≠ 'are there any'.
I'm watching for the Pria Ghia.
One of those first two video showed examples of geopolymer technology and it included the Roman Coliseum and the Great Pyramid!
They show examples that have a fine grain, that take a polished mold surface well and even show examples with colorizers for pieces that look like cast bronze.
The second one shows that alkali based recipes leach potassium, and the third one discusses producing nano-sale aggregate materials on a mass scale. Concrete aerogel, as it were.
I've watched all three now, and this one:
It's a little heavy on the chemistry.
