I first read about metallic microlattices on the BBC website last week.
What really grabbed my attention wass the photograph in the article:
Please see below for the copyright information relating to this image
The substance is believed to be the worlds lightest material. It is 100 times lighter than Styrofoam and has a density of 0.9mg / cm3 – less than what were the worlds lightest materials, silica aerogels.
The sustance is 99.99% air, 0.01% solid.
The walls are 100 times thinner than a human hair.
 This image was sourced from wikipedia – after reading the licencing information on wikipedia I believe that this work may be copyrighted but I have published it using the same rationale as wikipedia has used (http://en.wikipedia.org/wiki/File:Metallic_microlattice.jpg). If this image is copyrighted, or if it is incorrectly sourced, please leaver a message and I will happily delete the image or remove it or correctly source it.