Is a Use Bookstore a Good Idea?

There's actually a use book store in mazula, and i don't know if other places have something like this. You can take your books and they will give you credit, and then you can get thother for free,. And i have like a hundred and 50 dollars in credit at that store right now, so i basi, i can go in there and as long as i'm buying a used paper back, it's free. Hank, this question comes from taylor, and it's tailor mad for me. Do we actuallyc the periodic table, or did we invent it? Are all discoveries and nature inventions to allow people to better understand the universe? Or are the