Textbooks are meant to be read sitting at a desk, with a notebook and pen on the side. You are supposed to summarize the information in written form and answer

Textbooks are meant to be read sitting at a desk, with a notebook and pen on the side. You are supposed to summarize the information in written form and answer the end of chapter questions. Reading on the bus gets you barely any mileage out of the textbook - you are better off reading a popular book on the subject.