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Note how the ejection corresponding to the upper left arrow runs out of momentum (velocity AND mass!), and stops falling! Former-its particles then join the former tower's other tiny remnant particles in not falling...

So, obviously, Dr. Robert M. Gates, the former Director of the Central Intelligence Agency (CIA) and former Secretary of Defense, is a big liar (or else a huge fool), to say the least.

WTC Free-fall Physics discussion