Made up of over 90 percent air by weight, aerogels are the lightest materials in existence and among the best thermal insulators. But their cloudy appearance means they don't lend themselves well to ...

Qingkun Liu, a posdoctoral researcher in physics, lifts up a petri dish holding samples of a new aerogel. (Credit: CU Boulder) Can a new type of transparent gel, made from readily-available beer waste ...