system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are school textbooks so large and complex, when teachers never have time to use the whole book in a year?
gpt
Because they want to cover as many different topics as possible and some teachers might want to cover different things than other teachers. Also they should offer pupils the possibility to read them by themselves and thereby cover things that the time is missing for.