There are books of the same chemical composition as dynamite. The only difference is that a piece of dynamite explodes once, whereas a book explodes a thousand times. ― Yevgeny Zamyatin
It's an excellent selection of idioms that can come in handy for non-native speakers of English. The situations didn't feel far-fetched. Learners of American English can use these examples of conversational English in a wide range of different contexts.
The set can be used for self-study purposes or in the classroom.
That was a good buy.