Did you know about Chernobyl disaster? It is the worst nuclear accident in the history occurred at Chernobyl,USSR on April,25 1986 at 01:23 AM. Poor design of nuclear reactor and negligence of operator both caused the havoc. The operator ignored all the warnings coming from the various sensors and also disconnected the emergency core cooling system. As a result neutrons went out of control and an enormous amount of steam built up in the pipes. An fluorescent blue light is produced from the reactor and spread over the region of 200 km. The Government of USSR claimed only of two deaths and some injuries but the spy satellite of U S toll of about 2000 deaths in this accident. Soil,water and vegetation over 60 sq km around the Chernobyl damaged and will remain radioactive for several decades.