BumbleBo, what you are saying is either flat-out untrue or massively misleading.
"G.Bush brother was in charge of security at the towers"
Untrue. He was a non-exec director of a company that provided some security services to the WTC. Other companies were responsible for other security services. He was not "in charge" of anything in particular.
"he ordered that sniffer dogs be removed weeks before the attacks."
Untrue. It wasn't his decision to downgrade the unusually high alert they'd had for a short time back to the more usual alert status. And there were still sniffer dogs working in the WTC. Indeed, one was killed in the attack.
"People working in the towers heard loads of drilling going on all over 2 weeks running up to the attacks (explosives being put in)"
Misleading. They were big sites, there was often construction work going on. There is no evidence of explosives, no discovery of explosives that failed to fire, no discovery of the miles of wiring needed to connect them all up, no-one in the WTC saw any evidence of explosives being installed, and no-one has come forward admitting they were part of the huge team of people who would be needed to actually carry out such an enormous job. Oh, and it's a flat-out stupid way to achieve what 'they' supposedly want to achieve.
"Finding out the steel can't melt with jet fuel"
Misleading. Steel won't melt in a jet fuel fire but then it didn't have to melt. All it had to do was weaken and the fires were easily hot enough for that to happen.
"only very advanced explosives"
Untrue and misleading. There weren't any explosives required to bring down the towers. Anyway, explosives don't melt things, they destroy them with shock waves.
"...that there was no wreckage found when flight 93 crashed into a field "
Untrue. There was a lot of wreckage found in and around the hole it dug into the ground.
But, hey, since when have facts ever got in the way of a good conspiracy theory?