2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/8689The abundances of the {\it rare} light elements, Li, Be, and B, provide clues about stellar structure and evolution, about Galactic evolution and about their nucleosynthesis, including production during the Big Bang. The abundances of the {\it abundant} light elements, C and O, reveal information about the chemical history of the Galaxy and the mass spectrum of early generations of stars.Paper for Lambert Symposium: "Cosmic Abundances as records of Stellar Evolution and Nucleosynthesis" 14 pages, 15 figures, 1 tableAstrophysicstext