Dang... I was kinda hoping you were talking about a specific building. I know they are doing some amazing things with glass these days like transparent solar power embedded within, as well as auto-darkening to keep the people inside from needing sunglasses, piping inbound light with fiber optics, etc. I wouldn't be at all surprised if someone was using glass that thick for protection. I know some government buildings are treated to prevent vibration from sound and to scatter laser and be not only bullet proof, but bomb proof, etc.

Too bad you didn't RC, I was looking forward to the info! <img src="/images/graemlins/smile.gif" alt="" />