Aerogel, also know as froze smoke, is the world' s lowest
density solid, clocking in at 9684', air. If you hold a small
piece in your hand, it' s practically impossible to either see
or feel, but if you poke it, it' s like styrofoam. It supports
up to 4, 000 times its own weight and can withstand a
direct blast from two pounds of dynamite. It' s also the
best insulator in existence.