NEW YORK -- Most Manhattan office buildings are designed for paper pushers, but there is a new factory running at the end of a long dim corridor on the fifth floor of the Empire State Building. Here machines are whirring, a furnace is roaring and dozens of blue-collar workers are bustling about. They are setting up to dismantle the building's 6,514 double-hung window frames, to reuse the glass and make them anew. It is part of one of the nation's most ambitious and symbolic energy-efficiency programs: a $20 million effort to cut the skyscraper's overall energy use by 38 percent. Go to story #1