Hey Everyone, Please help settle a bet between a co-worker and myself. Neither of us are trained physics (I have a philosophy degree and he has a computer science degree), but we are both "amateurs" interested in physics. OK, here's the issue: My friend argues that time, explained as the "fourth dimension" of space-time is a cold hard fact that has been proven by many experiments and observations. I, on the other hand, claim that this view of time is still just a "theory"; that although this theory seems to satisfactorily explain many of the experimental results and physical observations thus far, that the absolute Truth of the nature of time has not yet been "proven" since there are exceptions to the theory (as in quantum physics, for example) and we are all still "learning" about physics and physical truths every day. This is not to say that we should not "follow" the theory and continue to use it since it HAS proven very stable in various equations and physical applications, but we should also be aware that new experiments and understandings may show that this theory is incorrect or incomplete. We've tried to find books at our local library to prove our respective points, but frankly it has been very difficult to find references to this specific issue (fact or theory) without reading 12 different textbooks. Both of us feel we've read these views before or learned them somewhere, but neither of us can remember where. If anyone out there could suggest a few books on the subject, point us in the right direction, and of course, settle our bet, it would be greatly appreciated. Thanks!