  Neutrinos play a crucial role in many aspects of astrophysics and cosmology.
Since they control the electron fraction, or equivalently neutron-to-proton
ratio, neutrino properties impact yields of r-process nucleosynthesis.
Similarly the weak decoupling temperature in the Big Bang Nucleosynthesis epoch
is exponentially dependent on the neutron-to-proton ratio. In these conference
proceedings, I briefly summarize some of the recent work exploring the role of
neutrinos in astrophysics and cosmology.
