A new, ultra-light form of “frozen smoke”, or “multi-walled carbon nanotube aerogel”, has been developed by scientists at the University of Central Florida in the United States. The aerogel is the world’s lightest solid material, and has amazing strength and an incredibly large surface area. It could be used in sensors to detect pollutants and toxic substances, as well as in chemical reactors and electronics components. A report regarding the new material has been published in the journal ACS Nano, describing the process for making the aerogels and tests to determine their properties. The MCNT aerogels are excellent conductors of electricity, a property that will make them ideal for sensing applications.