What is the difference between crystal and glass
Artistic

What is the difference between crystal and glass?

Its brilliance does not deceive us, but yet we are entitled to question the difference between crystal and glass. Especially since crystal and glass are both composed of silicon oxide, in other words sand subjected to very high temperatures to make it melt. […]

Alhazen also nammed Ibn al-Haytham
Inventors

Alhazen, the scientist who hides to save his skin

Abu Ali al-Hasan Ibn al-Haytham, named Alhazen, is a mathematician, physicist and philosopher born in Basra, in ancient Iraq. He is the first physicist to understand why the moon and the sun appear larger when they are close to the horizon. […]