Chernobyl begs a lot of questions 25 years later.Photo: Pedro Moura PinheiroCross-posted from The Guardian. Containing the elemental forces that rage inside a nuclear reactor is one of the great achievements of science, but losing control, as happened 25 years ago today at Chernobyl, is one of its greatest failures. So what to think of nuclear power? People often ask me if I support or oppose the building of new nuclear power stations, presuming that because of my job, I'll know the answer. If only it were that easy. Until the disaster at the Fukushima nuclear plant, I would say I was 51 percent …