Wang Chengzhou, a waste picker, studies how to calculate winning numbers at his "home" under a bridge crossing the Yangtze River in Southwest China's Chongqing municipality, on June 8 last year. He has studied lottery results for three years and dreamed of winning a big prize to open a company. With the widening wealth gap, the lottery offers a convenient short-cut for low-income earners to get rich. [Photo/CFP]