[FONT="]Stacy Loizeaux:[/FONT][FONT="] The term "implosion" was coined by my grandmother back in, I guess, the '60s. It's a more descriptive way to explain what we do than "explosion."[/FONT]
What Stacy is describing here is how they started to use the term "implosion" as a figurative way to describe the collapse of the building. They don't mean it literally. They don't define the word, either. The word "implosion" dates from the 1870's. By the way, you can find her entire interview with Nova here:
http://www.pbs.org/wgbh/nova/kaboom/loizeaux.html
If you read the transcript there she'll say things like:
Stacy Loizeaux said:Well, the explosives are really just the catalyst. Largely what we use is gravity.