作者: Edited by Li Liangzi

This book mainly includes: what”s in the earth, why there are scars on the earth, whether there are earthquakes in the north and south poles, how the names of the seven continents came from, why …

This book mainly includes: how animals evolved, why hibernating animals can survive from hunger, what the function of animal tails, what the function of animal tongue, why lions is called the king, …