High school students in Fukushima started a discussion group with a twist. They are exploring the nuclear disaster that poisoned their prefecture in 2011, as well as how accidents can be prevented in the future.

Delegates from around the world have gathered in New York to talk about the most dangerous weapons on the planet. They are at work at the Nuclear Non-proliferation Treaty review conference. The agreement took effect in 1970, but 45 years on, thousands of nuclear warheads are still in existence.