Condition - Very Good The item shows wear from consistent use, but it remains in good condition and functions properly. Item may arrive with damaged packaging or be repackaged. It may be marked, have identifying markings on it, or have minor cosmetic damage. It may also be missing some parts/accessories or bundled items.
X Stands for Unknown
'X' Stands for Unknowns is written in 5 sections. Issac Asimov is not just one of the world's greatest science fiction writers, but, he is one of the world's greatest philosophers. The 5 sections are: -Physics -Chemistry -Astronomy -Mathematics -The Fringe Each section has a few chapters, and every single chapter starts with a personal anecdote from Isaac's life, as a segway into the science.