There are 440 nuclear reactors operating the world today, and nuclear power provides ten percent of the world's electricity. In the wake of six major nuclear incidents—Bikini Atoll, Kyshtym, Windscale, Three Mile Island, Chernobyl, and Fukushima—Cold War expert Serhii Plokhy balances the risks and rewards of nuclear power. Plokhy does not shy away from the tragedies nuclear energy has caused, even as he considers the good it might offer in the future.