US engineers unveil world's 'lightest material'

From the laboratories of the University of California, the material is made out of miniscule hollow metallic tubes arranged into a diagonal criss-cross pattern, leaving no wasted space and not compromising weight, while also maximizing energy absorption.  All of this adds up to what the researchers call a material that is 100 times lighter than styrofoam: having a density of 0.9 milligrams per cubic centimetre.