http://www.popularmechanics.com/tech...ecture/4278874
and yes, rosie o'donnell you fat pig, steel does and can melt. but it'll lose it's integrity long before that happens.
http://www.popularmechanics.com/tech...eering/4213805
Steel melts at about 2,750 degrees Fahrenheit—but it loses strength at temperatures as low as 400 F. When temperatures break 1000 degrees F, steel loses nearly 50 percent of its strength. It is unknown what temperatures were reached inside WTC7, but fires in the building raged for seven hours before the collapse.