so charles assaulter, you work with charlie, an old friend of ours that i went to high school with. >> really. >> really, in high school. he does a lot of this in the city and he's come and given us one of these brown bag lunches with acoustical separation and talked about just what he's saying, using different thicknesses of material. the assembly has to go beyond the glazing, it has to be the building wall assembly that reduces outside noise. >> tempered glass is designed to take impact. that would have broken the window glass or the plate. i'm trying really hard. this doesn't want to break. let's give it a real... you know, so it's a good product. it's interesting. this center is the strongest part. the weakest part is at the edg edges. it takes quite a bit of impact, as you see. but -- in a quake, when they say don't leave the building, you know, there's a reason. you're probably better staying inside, under a desk or whatever else, because it's probably not going to be the glass that falls down but the cornice, some of the ornamental brickwork. who knows. we're likely to get hit