OK, I'm kind of upset right now and I was hoping someone would have an answer for my question. Right now I don't have too much money but I need to buy my Classical Dynamics text book. The book is Thornton 5th Classical Dynamics of particles and systems. New at the book store at my school the price is $277.00 dollars. But online the INTERNATIONAL EDITION is around $40 to $50 dollars. So what do I do????!!! Do I just buy the international edition and "HOPE" that the problems and questions have the same numbers as the US edition? I did find a US edition for about $150.00 dollars used online but still, what do I do??? Sorry, but I get really upset when I'm in situations like this. So does anyone know if these two versions are the same?