![¿Es Duro? / What Is Hard? [Spanish] 1538250004 Book Cover](https://i.thriftbooks.com/api/imagehandler/l/109F7F2D2A07B1D538E5037CF6F41D8A90FC7824.jpeg)
It's easier to name hard things, like rocks, than understand what this characteristic really means. This book encourages young scientists to observe the world around them and discern the features of various familiar things. They'll come to learn that anything that can't be easily...