Were explosives placed in WTC towers when they were built ?

A Government that shows very little interest in finding real answers to the who, why, where & how and instead just seems to 'know' - presenting a nice little pre-fabricated story & ignoring all evidence / debate to the contrary, along with collecting Video / Photo Evidence & censoring it's release. What does that say ?
Leaving evidence on site for 3 days before carting it out of the country to be destroyed is not saying much. What can be determined from Wreckage without scientific / chemical analysis ? Very Little.
How many opportunities to study the effects of a Jumbo Jet impact on High-Rise Structures have there been ? - Why wouldn't they want the evidence examined & lessons learned for future Construction progression / development ? I smell a cover-up a mile away.

a reply to: Philby

all tall buildings in highly populated areas are equipped with explosives through their internal structure. its to minimise collateral damage if anything (9/11ish) happens.