| | Kryptonite - Wikipedia, the free encyclopedia |
 | | The element, usually shown as having been created from the remains of Superman's native planet of Krypton, generally has detrimental effects on Superman. |
 | | It was a mildly radioactive element that was formed in the crust of the planet Krypton as the result of an ancient Kryptonian war. |
 | | It is speculated that kryptonite may be located in a hypothetical "island of stability" high on the periodic table, beyond the currently known unstable elements, in the vicinity of atomic number 150. |
| en.wikipedia.org /wiki/Kryptonite (5915 words) |