यदि आप इस वीडियो को नहीं देख सकते हैं, तो आपका ब्राउज़र एचटीएमएल 5 वीडियो का समर्थन नहीं करता है
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On September 11th 2001,  a third skyscraper also collapsed later that day at 5:20 p.m, within 70 feet of its footprint (according to FEMA) in about 6.6 seconds. (That’s really fast.)
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