Would that be "experts" in magic tricks, or military deception operations, or experts in rubbish, or experts in propaganda? Yes I am being sarcastic, because I do not believe in magic, or nationalism, or patriotism, or party politics, or religion, or experts, or TV propaganda, or elites, or oligarchies, or any faith based appeals to "authority". This, hypothetically speaking, virtually irresistible force of gravity being the only energy source of the hypothetical kinetic energy explosiveness, is asking rather too much of gravity, in my opinion. Energy has to come from somewhere and when you use gravity as the only energy input to convert potential energy into kinetic energy explosiveness, on such a dramatic scale, you necessarily create deceleration, through resistance. You cannot "have your cake and eat it at the same time" or turn "gravity" into an essentially irresistible force that can, apparently, simultaneously create additional energy out of nowhere to create this absurd idea of low resistance kinetic energy explosiveness. That idea is as stupid as so many imbecilic Americans believing in the Rapture, Obama, party politics, nationalism, patriotism, and these brain-dead-worms intoning loathsome meaningless drivel like saying "God Bless America" or that disgusting brainwashing "US pledge of allegiance" mantra, or imbecilic slaves "serving" in the evil US military! You can find "experts" in religion and all kinds of meaningless rubbish, including expert "scientist experts" who are apologists for evil war criminal neo-nazi imperialist regimes like in the USA that used 9/11 terrorism as a political pretext to mass murder innocent peasants in Afghanistan and Iraq. Innocent peasants who were certainly nothing to do with any 9/11 attack by (theoretically) 19 grumpy suicidal people who might justifiably "hate American freedoms" to murder Third World peasants in an orgy of "revenge collective punishment" through illegal wars of aggression. I have no idea what caused WTC1, 2 and 7 to blow up and fall out of the sky, in a virtually resistance free manner, but if it was "gravity" it was evidently not even being a consistent force for kinetic energy explosiveness on 9/11. Because WTC1 and 2 Exploded (kinetically or otherwise) in a virtually resistance free manner, whereas WTC7 Imploded.