This document discusses the development of a new type of lightweight material called aerographite. Aerographite is an ultra-light carbon nanotube-based foam that is 100 times less dense than balsa wood. It was created by growing a highly porous network of carbon nanotubes on a template substrate then removing the template, leaving behind a nanotube structure that is over 99% air. Aerographite is one of the world's lightest solid materials and has potential applications in aircraft, batteries and insulation due to its unique combination of lightness, strength, and thermal properties.