Daily chart: nuclear security. This chart shows the 32 countries that possess over one kilogram of nuclear material suitable for use in weapons, ranked by their ability to keep the stuff safely locked up. Nuclear-armed nations tend to have lower scores, mainly because they have big stocks of nuclear materials held in many locations.

Daily chart: nuclear security. This chart shows the 32 countries that possess over one kilogram of nuclear material suitable for use in weapons, ranked by their ability to keep the stuff safely locked up. Nuclear-armed nations tend to have lower scores, mainly because they have big stocks of nuclear materials held in many locations.