College textbooks have always been a scam. 30 years ago when I took calculus 1-3 they tried to make us buy the next edition of the same book each semester! Even

College textbooks have always been a scam. 30 years ago when I took calculus 1-3 they tried to make us buy the next edition of the same book each semester! Even I, country-come-to-town bumpkin at the time, saw through that and refused.