Making Light:  Styrofoam tits ::: May 11, 2006, 04:16 PM

Aside from the cost, and the fact that aerogel shatters like glass
(which it is, after all), it's terribly vulnerable to a water attack.
When aerogel gets wet, it stops being a super-light glass and becomes
a glass that is heavier than the fat it was supposed to replace.