一共11本的万能套装。包括：
100 things to know about music
100 things to know about the unknown
100 things to know about space
100 things to know about food
100 things to know about science
100 things to know about history
100 things to know about the oceans
100 things to know about planet earth
100 things to know about the Human body
100 things to know about saving the planet
100 things to know about numbers, computers and coding
知识面丰富涵盖了时下的各种话题。适合8-9岁的孩子。孩子一有空就抱着读。😄