Last Saturday, Oct. 24, Honduras became the 50th state to ratify the 2017 Treaty on the Prohibition of Nuclear Weapons (TPNW), which will trigger the treaty’s entry into force ninety days later, on January 22. Coming at a time when nuclear weapons risks are rising, the TPNW marks a new hopeful phase in the long-running struggle to prevent nuclear war and eliminate nuclear weapons. For the first time since the invention of the atomic bomb, nuclear weapons development, production, possession, use, the threat of use, and stationing of another country’s nuclear weapons on a state party's national...