In the recently held Guangdong Self-made Teaching Tools Competition, teachers from ZS pocketed two first-prizes, 10 second-prizes and 7 third-prizes. The first-prize winning tools, invented by Hu Tianyong, are a device to demonstrate the rule of changes in day and night length. A multi-functional music box is invented by Xie Ying from Xiaolan Fenghua School. The inventions caught the eyes of judges and won praise.