Polystyrene homopolymer, known as “crystal" polystyrene in the trade, is an amorphous, colorless, and transparent commodity thermoplastic. It is rigid, brittle, relatively hard and has excellent gamma ...

A team of Harvard engineers have made a walking robot that assembles itself origami-like from a flat sheet in four minutes. Key to the machine is a composite of paper, polystyrene sheet, and printed ...