A nearly-completed 13-storey Shanghai apartment building toppled over, killing a worker and raising concerns in China's largest city over construction standards.  Shanghai Mayor Han Zheng ordered a full investigation into the cause of the incident, which occurred in the southwestern part of the city.  A 28-year-old migrant worker, surnamed Xiao, who entered the building to collect his tools, was killed after trying to jump out of a window as the building fell...more