Theory suggests that metallic hydrogen should be a superconductor at room temperature; however, this material has yet to be produced in the lab. Metal superhydrides are packed with hydrogen atoms in a configuration similar to the structure of metallic hydrogen. Models predict they should behave similarly. Samples of superhydrides of lanthanum have been made and tested, and at the 2019 APS March Meeting in Boston, Russell Hemley will describe his group’s work studying the material.