NPR: Although Los Alamos National Laboratory is known for designing nuclear weapons and maintaining the viability of the US stockpile, the lab is also a center for finding ways to stop the spread of nuclear weapons.Los Alamos has trained some 5000 inspectors for the International Atomic Energy Agency (IAEA) over 30 years. They’ve come from more than 40 countries, according to David Bracken, a former deputy group leader.