“ Meta-meta materials Just posted one possible way to build such materials here: http://lichtman.ca/technology/meta2-materials I posted back to... (read full comment) ” 

Posted on December 27, 2011 at 9:26 PM EST

“ Radiation I can't speak to the math, but isn't the radiation just a matter of ensuring that the spacecraft is adequately shielded? (read full comment) ” 

Posted on April 3, 2009 at 5:28 PM EDT