Educational videos Welcome to the K=1 Project Learn about the mission of the K=1 Project, Center for Nuclear Studies at Columbia University. Why are we called the K=1 Project? A lot of people ask us about the name of our center, the K=1 Project. Where does it come from? How do fission weapons work? In this video, we take a look at fission weapons and how they work. How do fusion weapons work? Having discussed fission weapons in our last video, we now move on to the much more powerful class of weapons: fusion weapons. Non Proliferation Treaty (NPT) The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) is one of the most important disarmament agreements of all time. Comprehensive Nuclear-Test-Ban Treaty (CTBT) The CTBT marked a large step in the effort to control development of nuclear weapons. Its main goal is to create a worldwide ban on the testing of nuclear weapons. Treaty on the Prohibition of Nuclear Weapons The Treaty on the Prohibition of Nuclear Weapons was presented in 2017 with the ambitious goal of, as the name implies, prohibiting all nuclear weapons.