Thirty years ago today, April 26, 1986, the nuclear reactor at Chernobyl, Ukraine, then part of the Soviet Union, melted down creating a 2000-ton radioactive blob that blew the roof off the reactor and released 10 tons of radioactive debris into the air. It is the worst nuclear accident in history. Today there is an “exclusion zone” 30km in radius and almost 1000 square miles in area surrounding the reactor site. It is uninhabitable although the London Daily Mail reports that 7000 workers are still employed in the clean up effort. These are people who lived in the area before the disaster. None are safe, and all are tested daily as they exit the exclusion zone. Estimates vary from 3000 to 20,000 years before the area will be safe for human habitation.