Committed environmentalists know that nuclear power is bad. Evil. The worst. We’ve been trained by incidents like Three Mile Island, Chernobyl, and Fukushima to fear the inevitable disasters that radioactivity will surely wreak upon our energy-hungry world. Not to mention the apocalyptic weaponry that nuclear power begets. It’s a settled issue. According to the provocative and enlightening documentary “Pandora’s Promise,” a beautifully made and persuasively argued challenge to progressive-minded Groupthink, the issue is far from settled. Indeed, director Robert Stone suggests that thanks to third- and fourth-generation reactors, some of which are being designed to use their own radioactive waste as fuel, nuclear power may prove to be a better answer to our energy questions than wind and solar. Crazy? Blasphemous? A cynical propaganda ploy by rich folks with atomic investments? Watch, learn and decide for yourself.