Beijing: A Chinese construction company is claiming to be the world’s fastest builder after erecting a 57-story skyscraper in 19 working days in central China. The Broad Sustainable Building Co put up the rectangular, glass-and-steel Mini Sky City in the Hunan provincial capital of Changsha using a modular method, assembling three floors per day, company vice president Xiao Changgeng said. The company, which has ambitions to assemble the world’s tallest […]