What, you may ask, is aerogel? Aerogels are the worlds lightest solid materials, composed of up to 99.98% air by volume. Aerogels are a diverse class of amazing materials with properties unlike anything else. Transparent superinsulating silica aerogels exhibit the lowest thermal conductivity of any solid known. Ultrahigh surface area carbon aerogels power todays fast-charging supercapacitors. And ultrastrong, bendable x-aerogels are the lowest-density structural materials ever developed.