Sand + Sun = Glass. This project by Markus Kayser is an amazing example of what is possible. The technology is based on sintering – a method used to create objects from powders.  Markus has created a machine that uses the sun’s energy to manufacture 3D objects using sand.  In sintering, powders are heated to just below the melting temperature, at which point the powder diffuses evenly and is bonded together forming a cermic-like...