Shang Yang reformed many fields. Before the reform, he placed a log（原木）at the gate and promised, "If someone can move the log, he will get a reward." No one believed him until someone moved the log, Shang Yang really gave him a reward.

Do you know Lu Ban lock? It is a removable toy. Lu Ban made it for his son. His son studied all night before opening it. He also invented many tools and weapons（武器）. 

Li Bing was an expert in water projects. He set up many water projects. Dujiangyan is the most famous. It made water helpful to the people.

Once, an official fell unconscious（昏迷的）. Everyone thought he was dead except Bian Que. Bian Que felt his weak pulse and said. "He will wake up in three days." Two days later, the official woke up. Everyone was amazed.

When Bo Ya played, even the horses looked up, listened to his music and stopped eating. Bo Ya's friend, Zhong Ziqi, understood his music. They liked each other. After Ziqi died, Bo Ya broke his guqin and never played it any more.