Neutron scattering has proven to be a powerful tool to track the way atoms behave when they've been hit with an outside force like a change in temperature, pressure, or magnetic field. When a powerful beam of neutrons collides with a target material, the neutrons scatter, and in the process reveal a great deal of information about the material itself. These images, taken at Oak Ridge National Laboratory using a Wide Angle Neutron Diffractometer, show how Pr0.7Ca0.3MnO3, a semiconductor at room temperature, becomes an insulator when cooled (top images). The reverse is true for La0.7Ca0.3MnO3, which has insulating behavior at high temperatures but becomes a metal when cooled (bottom images). Neutron scattering has applications in everything from clean technology to optical communications and is a promising field for graduate students. UT is building on-campus materials and neutron scattering programs to take advantage of nearby facilities like the Oak Ridge High Flux Isotope Reactor (HFIR) and the new Spallation Neutron Source.