Dr. Biology travels to the National Center for X-ray Tomography in Berkeley California to learn about a new microscope being built by cell biologist Carolyn Larabell and a team of scientists that provides a new way to look inside cells. Using a building-sized instrument called a synchrotron for its light source the XM2, as it is called, uses x-rays to look inside cells In fact, it is so new it is the only one of its kind in the world!