Instruct: Classify the given review as either positive or negative.
Query: Come back later

Even though this book is marketed (and meant) as an accessible exposition of relativity theory, with the considerable advantage of being by Einstein himself, it is not as easy to read as the presentation may imply. Einstein says in his introduction that his reasoning will demand no more than high-school knowledge of the relevant subjects. Maybe this was true in his time, but nowadays the book demands way more than that. I'm myself a grad student in the field of literature and I simply couldn't follow the presumably basic mathematical demonstrations Einstein relies upon to make his points. Some concepts are also less than obvious for the non-specialist ('galilean coordinates'?). This is not to say that the book itself is not good, but that it is targeted at a readership which is not necessarily trained enough to benefit from it.