<img src="http://www.crunchgear.com/wp-content/uploads/2010/02/aerogel.jpg"><a href="http://www.crunchgear.com/2008/08/26/aerogel-glass-that-is-998-air-gets-put-through-the-paces/">Areogel</a>, the 90
The world’s lightest known solid, Aerogel, weighs only three times as much as air. As air, mind you. You could practically breathe the stuff, but you wouldn’t want to because, basically it’s gla