Until I read a book where the author gives strong technical proof that it was impossible for the two planes to bring down the two towers and also the third building
Yes, I might have thought it not possible for two planes to bring down the two towers until I saw it on live TV with my own eyes.
"Until I read a book......." indicates you now believe it. Pretty sad. You need to read some more by real engineers without an agenda. There's a lot more valid engineering that says your belief is nonsense. You need to read that WITH AN OPEN MIND.
Beyond that simple logic can prevail here if you're capable of recognizing it.