For the students in Jianshelu Third Primary School in Zhengzhou city, learning science can be as interesting as playing a game - a game of chess.

Science teacher Yan Hewang has invented many teaching tools that integrate knowledge into chess games so that his students no longer memorize everything by rote.

Over the past 20 years he alone has been granted five patents for the gadgets and games he invented, along with 10 other patents in partnership with others.