Schoolchildren sell their unused books and toys at the Hongwu Beilu Primary School in Nanjing, Jiangsu province, on May 7, 2012. The proceeds will be donated to the Nanjing branch of the Red Cross Society of China to mark the World Red Cross and Red Crescent Day on May 8, 2012. [Photo/Asianewsphoto]

Zhang Wuyi, a 37-year-old former boilermaker, waves to onlookers before taking his self-made submarine under water in Wuhan, Hubei province, on May 8, 2012. [Photo/Asianewsphoto]