The Reality Frame: Relativity and our place in the universe\n\nBuy Pre-loved\n\nBooks, DVDs, CDs & Video Games\n\nA Sustainable Cycle\n\nSaving millions of items from landfill\n\nSaving You Money\n\nand helping the environment\n\nBuy Pre-loved\n\nBooks, DVDs, CDs & Video Games\n\nYour browser does not support the video tag.\n\n1 of\n\n1\n\nPreowned\n\nCondition Grading Info\n\nUsed - Like New: Item may have minor cosmetic defects (marks, wears, cuts, bends, crushes) on the cover, spine, pages or dust cover. Dust cover is intact and pages are clean and not marred by notes. Item may contain remainder marks on outside edges. Item may be missing bundle media.\n\nUsed - Very Good: Item may have minor cosmetic defects (marks, wears, cuts, bends, crushes) on the cover, spine, pages or dust cover. Shrink wrap, dust covers, or boxed set case may be missing. Item may contain remainder marks on outside edges, which should be noted in listing comments. Item may be missing bundled media.\y