Log in
There’s more to see...
Sign up to see the rest of what’s here!

Cyanometer circa 1789, an instrument that measures the blueness of the sky

Translucent Lightweight Concrete - It is made by Porjoel Sosa and Sergio Omar Galvan, Mexico. The material is 30% lighter but has the same strength, consistency and resistance as regular concrete, while allowing 80% light transmittance. It comes in a variety of colors.

flying peacock

The Friday Shirk Report - Volume 133