AE911Truth | According to the official story the north tower of the World Trade Center (WTC) collapsed by gravity. This was challenged in an analysis of Graeme MacQueen and Tony Szamboti and a related analysis of David Chandler (both in the Journal of 9/11 Studies). The Balzac Vitry demolition has taken place by gravitational collapse. The analysis that was applied to the WTC is applied to this demolition, with different results. This analysis supports the conclusions of the two studies: the north tower of the WTC does not collapse due to gravity.