Physicists ask questions about matter (from tiny particles to the entire universe and its galaxies), energy, and the interactions between them. They run experiments and observe the ways things behave in order to find answers. The information physicists discover is used to build and power machines and to understand the ways natural materials (as well as the ones we make) behave here on Earth and in outer space.
Physicist-turned-Diplomat Nicholas Carrera studied halide crystals (used in photography and medical technology) and flew a plane through clouds to help figure out whether crystals like those he had worked with could “seed” clouds and produce rain. After Nuclear Physicist Robert Rochlin invited Carrera to join the Arms Control and Disarmament Agency (ACDA), Carrera examined seismic stations which measured the earthquake-like effects produced at nuclear test sites around the world. He is proud to say that thanks to the work of the ACDA and other diplomatic efforts, “the major nuclear-weapon states are no longer conducting nuclear explosions.”