Students at a middle school use iPads during a history lesson in Nanjing, East China's Jiangsu province, Sept 18, 2012. Altogether 21 public primary and middle schools in Nanjing are planning to provide iPads or laptops to students. [Photo/CFP]

Honor guards parade on Tuesday in front of the 9.18 Historical Museum in Shenyang, Liaoning province, in remembrance of the incident on Sept 18, 1931, that was followed by Japan’s invasion of China. LI GANG / XINHUA