Aerographite: 99.99% Air (Take that Aerogel's 99.98%)

Scientist from Kiel University and Hamburg University of Technology have created “Aerograhite”; a material with a density four times lower than the previous record-holder. Coming in at only 0.2 milligrams per cubic centimeter, aerographite is a fine mesh of carbon nanotubes that has some astounding physical properties. The opaque material is electrically conductive and ductile. Aerograhite can be compressed up to 95% and be pulled back to its original form without any damage. "Up to a certain point the Aerographite will become even more solid and therefore stronger than before" says professor Rainer Adelung of Kiel University, who points out that many materials become weaker when exposed to such stress. Researchers in multiple fields are already astir with ideas for aerographite, ranging from use in Li-ion batteries to lightweight conductive plastics to air and water purification.