In September, North Korea tested its fifth nuclear device, its second this year and its most powerful so far. The move left the international community nervous and divided how to respond to North Korea’s nuclear progress.

When nuclear weapons come to the forefront of the news, we've become accustomed to hearing from the usual suspects: politicians, journalists, and analysts. But we're less used to hearing from nuclear scientists - something that the Union of Concerned Scientists, since the late 1960’s, has been trying to change.