An easy experiment to see a structure collapsing from top down is to use any man made structure and disconnect the 10% top part from the 90% bottom part - raise the top part 3 meters - and drop the 10% top part on the 90% bottom part.
Anyone can do it! NIST, CIA, FBI, NSA, GWB, Donald Trump!
The structure may be of any type, any material, any size but the 90% bottom must be able to keep the 10% top in place before disconnection and drop for collapse attempt.
If you can find any such structure that collapses from top and describe it to me, I pay you €1,000,000:- (one million!) by bank transfer.
http://heiwaco.com/chall1.htm I have tested many different types of structures but the 10% tops always bounces on the 90% bottom parts at contact. I wonder why? A top part slamming into a bottom part ... and there is no
COLLAPSE? Am I part of a conspiracy? GWB & Co. have always said since 912 (2001) that there should be a
COLLAPSE. Is GWB not telling the truth?
Or is the 90% intact bottom part always strong enough to bounce off or stop the 10% top part dropping down from globally collapsing 100%?
If you want to, you can put the 10% top part on fire and drop it on the 90% bottom part not on fire. Do not burn yourself!
A nice experiment when spring is arriving (ice melting) is to fill an open air ice hockey rink (not an inside hall one) with only 4" of jetfuel (about 140 tons) and put a heap of 140 tons of steel, aluminium, concrete and similar scrap in the centre (where the game starts). I used to play ice hockey when young. Then ignite the jet fuel and see how it burns. No fire ball! Just plenty black smoke. The scrap in the middle just gets dirty. Inform the local authorities before doing it!