Worried about nuclear war? What about nuclear energy? How about radioactive materials? All of these things fall under the control of the Department of Energy. This Cabinet department is responsible for ensuring the quality and safety of our nation's nuclear weapons and nuclear reactors, as well as providing for the proper disposal of radioactive material and working on energy conservation. Each time a natural disaster threatens a nuclear reactor or the military decides it wants to destroy its nuclear weapons arsenal, the Department of Energy must respond. In this book, readers will learn exactly how this department keeps our country safe.