Gleb Garanich/Reuters On April 26, 1986, the core of a reactor opened at the Chernobyl Nuclear Power Plant, releasing enormous amounts of radioactive material like corium, uranium, and plutonium. In the months after the disaster, workers scrambled to build a covering, or "sarcophagus," to prevent the spread of contaminants. The sarcophagus is now teetering on […]