Related resources
Explainer
How Nuclear Weapons Work
At the center of every atom is a nucleus. Breaking that nucleus apart—or combining two nuclei together—can release large amounts of energy.
Video
UCS: What We Do
Breathtaking imagery from photographer Daniel Beltrá showcases the range of issues that UCS works on.
Activist Resource
Scientific Societies Call on Congress to Save Science
This open letter, signed by more than 40 prominent scientific societies and organizations, was delivered to Congress in March 2025.
Feature
2024 Annual Report
With your help, we made significant strides toward a better future in 2024.