Thats the most ignorant and moronic video i have ever seen. This software engineer talking like he actually has a clue about the design of the WTC towers, ha.. Thats laughable.

The towers are UNIQUE in their construct and thus fell uniquly! Do some reasearch and you will find that the 1000's of joint depicted and mentioned verbally in the video are NOT LOAD BEARING. The core of the building (elevator shafts) is where the vertical loads are transmitted to the ground. This design is what made the perfect "implosion" possible. People listen, steel looses about 60-75% of its stregth at 500 deg f ( +/-, dont quote me, ill be happy to find the exact numbers) A building is designed so each floor supports the weight of 1 floor, now there is some play room there, some will support 2 floors befor buckling. Now, the upper floors (impact area) were hold 2 floors when it was supposed to hold 1. Notice the building drops one floor, then it buckles almost instantly. After that each floor is being load 4, then 5, then 6 times what it is designed to hold. With each colapse there the next colapsed floor will accure even faster intill its instant. Now, thier 10 sec free fall is probably based on a human in bellow down position. Areodynamics aloud the building to travel faster than a human in freefall, this is easy to accomplish. Go sky diving and you will realize that nothing falls at the same speed. Different people fall at different speeds and I would imagine a huuge building with dozens of aerodynamic factors at play could out run a human by 20%.

im no architect, nor am i good with spelling or wording. so give me a break, and feel free to question me