Explore the detection of lithium in cool white dwarf atmospheres in this conference talk from the "White Dwarfs from Physics to Astrophysics" KITP online conference. Delve into the latest research on white dwarf model atmospheres, infrared photometry, and abundance analysis. Gain insights into the opportunities presented by astrometric, photometric, and spectroscopic all-sky surveys for studying white dwarfs as probes of various astrophysical phenomena. Learn about the implications for understanding star and planet formation, Galactic star formation rates, and low-frequency gravitational wave sources. Discover how improved models of these electron-degenerate stars rely on advancements in equations of state and opacities. Engage with experts in observational and theoretical white dwarf studies, fundamental physics, and astronomers using white dwarfs as diagnostic tools to gain a comprehensive overview of current research and explore new scientific opportunities arising from recent data.