But can the X-Ray Spex really help you see through fingers? Can you really see through an egg to the yolk? More important, can you see through clothing? Kirk Demaris, author of "Mail Order Mysteries: Real Stuff from Old Comic Book Ads!," spent years tracking down the junk sold in comic books -- and has the answer to this and other mysteries. Click "next" for the real story behind X-Ray Spex.