  I summarize the stellar side of the cosmological lithium problem(s). Evidence
from independent studies is accumulating and indicates that stars may very well
be fully responsible for lowering their surface lithium from the predicted
primordial value to observed levels through internal element-transport
mechanisms collectively referred to as atomic diffusion. While atomic diffusion
can be modelled from first principles, stellar evolution uses a parametrized
representation of convection making it impossible to predict
convective-boundary mixing as a vital stellar process moderating atomic
diffusion. More work is clearly needed here for a fully quantitative picture of
lithium (and metallicity) evolution as stars age. Lastly, note that inferred
stellar lithium-6 abundances have all but disappeared.
