Here is powerful evidence against the conspiracy nuts who say that the planes exploding on 9-11 could not have melted the steal beams and therefore, could not have caused the upper floors to collapse, bringing down the two towers of the WTC.

On the morning of April 29, 2007, a tanker exploded on a freeway interchange and melted the steal beams on the overpass above the wreck, thereby, causing the overpass to collapse onto the road below! The conspiranuts say that steal cannot be melted-- Well, HOW DO YOU THINK THE STEAL BEAMS GOT TO BE STEAL BEAMS? BY BEING MELTED AND POURED! Any fire that gets hot enough will melt steal beams!

Tanker Explosion Causes I-80 Connector Collapse
http://cbs13.com/topstories/local_story_119092138.html

(CBS5/KCBS) OAKLAND A section of Oakland's busy MacArthur Maze that funnels traffic onto the Bay Bridge collapsed early Sunday morning after a speeding tanker truck hauling 8,600 gallons of gasoline hit a guardrail, overturned and exploded into flames, authorities said.
tanker fire The tanker crash and ensuing fire occured about 3:45 a.m. along the interchange, which connects westbound lanes of Interstate 80 to southbound Interstate 880, about half a mile from the bridge's toll plaza.

Witnesses reported flames from the blaze reached up to 200 feet high. It took firefighters until about 5:50 a.m. to extinguish it, Oakland Fire Battlion Chief Mike Miller said.

road collapse
Intense heat from the fire melted a second interchange from eastbound I-80 to eastbound Interstate 580 located above the first interchange, causing a 250-yard section of the roadway to collapse onto the roadway below, according to the California Highway Patrol.