2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/476Our understanding of the evolution of He4 and Li7 depends critically on the available data for these two elements at low metallicity. In particular, the degree to which there is a slope in an abundance vs metallicity regression can help determine the evolution of He, C, N, and O in dwarf galaxies in the case of He, and cosmic-ray induced nucleosynthesis of LiBeB in our own galaxy in the case of Li. Recent data and their implications will be discussed.11 pages, latex, 5 ps figures, summary of talk at IAU Symposium 198: The Light Elements and their Evolution, eds. L. da Silva, M. Spite, and J.R. de MedeirosAstrophysicstext