Understanding the behavior of interacting electrons in solids or liquids is at the heart of modern quantum science and necessary for technological advances. However, the complexity of their interactions generally prevents us from coming up with an exact mathematical description of their behavior. Precisely engineered ultracold gases are emerging as a powerful tool for unraveling these challenging problems. Dr. Rey presents recent JILA developments using atoms in crystals of light for to investigate complex many-body phenomena and magnetism. She also discusses a new research direction using atomic clocks not only as precise time keepers but also as unique quantum laboratories.