[Richard Gage, a San Francisco architect and founder of the nonprofit Architects & Engineers for 9/11 Truth] is particularly disturbed by Building 7, a 47-story skyscraper, which was not hit by an aircraft, yet came down in "pure free-fall acceleration." He also says that more than 100 first-responders reported explosions and flashes as the towers were falling and cited evidence of "multi-ton steel sections ejected laterally 600 ft. at 60 mph" and the "mid-air pulverization of 90,000 tons of concrete & metal decking."