Students wear gas masks and protection gear during a duck-and-cover drill to practice self-protection methods in the event of an unexpected nuclear attack or leak in Shijiazhuang, Hebei province, on July 8, 2013. The drill was part of their nuclear safety education. [Photo/CFP]
High school students learn how to put on exposure suits during a nuclear disaster drill in Shijiazhuang, Hebei province, on July 8, 2013. [Photo/CFP]