> Lighter than air solid Is this even possible at normal temperature? I can't imagine this at 1 atm. and room temperature... after some googl-ing: http://en.

> Lighter than air solid Is this even possible at normal temperature? I can't imagine this at 1 atm. and room temperature... after some googl-ing: http://en.wikipedia.org/wiki/Aerogel http://en.wikipedia.org/wiki/Aerogel