From the cosmological Li problem to the Galactic Li evolution
  Li is the very element that presents deep insights yet many problems to
astrophysics. In this proceeding manuscript I first introduce a stellar
solution to the cosmological Li problem, which reveals that Li was first
destroyed and re-accumulated by these stars shortly after they were born, then
discuss Li in the interstellar medium in the form of the molecule LiH, and the
different Li enrichment histories seen in the Galactic thick and thin discs
with data from the Gaia-ESO survey.
