![Elementary school tries QR code-based homework(1/3)](http://www.ecns.cn/hd/2016/03/25/2197354d70434efab1392240d5cbc342.jpg)
A student hands in his homework by uploading a QR code online at an elementary school in Xi’an city, capital of Northwest China’s Shaanxi Province, March 24, 2016. Instead of printed or handwritten assignments, students in some classes can submit a QR codes to the school experimenting with new ways of teaching. (Photo/CFP)