Hi. So fortunately, I was given some money from my school to spend for books. It is solely just for books but I get to keep it. The problem is I can only pick one. For the other one, I will much likely loan, meaning I have to give it back by the end of the semester. So here's the question, which is worth keeping, physio or microbiology book? I want to keep it for future reference or if ever one of my friends need it.