OK, 'splain to me how Building Seven, never damaged by more than a glancing blow from part of one of the collapsing towers, fell in the same faster-than-freefall, classic demolition implosion?  That's the smoking gun. Never before in history have steel-framed buildings collapsed from fire alone. The towers were designed to take an impact from an airliner. You'd expect to find large chunks of concrete but it was all turned to fine powder. Thousands of architects and engineers have disputed the official gov't story. It's those who believe those planes caused the buildings to turn to dust that are the "nut-cases." When the probable cause becomes impossible the only thing possible is the improbable. Google "Architects and Engineers for 9/11 Truth."