Explosive "squibs" shooting out of the tower. Demolition charges:
http://www.explosive911analysis.com/WTC%201%20Collapse%204%20View.JPG


Explosive squibs:
http://www.explosive911analysis.com/G2.jpg

Core column support cut at angle (by thermate). Cut at angle so the column will shift sideways:
http://www.explosive911analysis.com/I2.jpg

Piece of steel from WTC, cut by cutting charge:
http://www.explosive911analysis.com/hands.jpg