Once upon a time, in China, there was a clever boy named Sima Guang. One day, when he played with friends in the yard, another boy climbed up a huge water jug full of water and fell in! Everyone else got scared and ran away, but Sima Guang was calm and picked up a big rock to break the jar. The water rushed out, and the boy was rescued. Sima Guang became a great politician, historian and essayist in the Song Dynasty.