if you look at that building you will see, above the windows, are large metal cases that hold rolldown shutters, that were intended so that they could separate the building from another 1906-style configuration, and continue to pump water out of the bay to this separate water system for -- so that they can -- and it was put in place after the '06 earthquake, when of course all of the water supplies failed in the city for fire protection. it's a great building. >> next question i have is if you can describe what's the difference between glass and glazing? >> glass is the noun, glazing is the verb and a glazer is the person that puts in the glass who glazes the glass. so glass is just the term for any one of these products, are glass. glazing is the process of putting in that glass, and you would put it in sometimes what people would call a glaze or putty. that's -- and -- the a archaic name of the man that puts it in is glazer. >> is there a way to create a more effective glass without the air-space issue? >> what happens is that air-space in between does not transmit heat because the t

the rolldown is complete, and "atlantis" heads down for the proper alignment for the ride to orbit, and 400 million pounds of equipment and humans on board. 40 seconds into the flight, the three liquid fuel main engines throttling back to 72% of rate of performance in the bucket reducing stress on the shuttle as it goes transsonic for the final time. engines now revving up, and standing by for the throttle-up call. >> "atlantis" go with throttle up, and no action dpt. >> throttle up, and no action on the dpt. >> that call from the captain with the transducer and instrumental only, and no action is required. "atlantis" now 15 miles in altitude and already 16 miles down range from the kennedy space center and 1:40 already into the flight. "atlantis" flexing its muscles one final time. "atlantis" traveling almost 2600 miles an hour at 21 miles in altitude, and 24 miles down range and standing by for solid rocket booster separation. booster officer confirms staging, and a good solid rocket booster separation, and guidance is converging and the main engine steering the shuttle on a pinpoint