My son is only 5 years old.He is in a kindergarden next to my mother-in-law's house.He is very naughty ,but he likes study also.These days  he becames interested in weiqi which is a traditional chess in Chinese culture.He often calls at me and wants me to play weiqi with him.he's a quick learner.Yesterday I taught him for half an hour and  he soon learned the concept of qi in weiqi.I'm so pround of him.