  Our 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.
