** Title:** Stable Homology of Aut(F_n)

** Abstract:** Let Aut(F_n) denote the automorphism group of a free group on n
generators. It is known that H_k(Aut(F_n)) is independent of n as long as
n >> k. There is a natural homomorphism from the symmetric group S_n to
Aut(F_n), I will sketch a proof that it induces an isomorphism from
H_k(S_n) to H_k(Aut(F_n)) for n >> k. An important point of view here is
that the classifying space BAut(F_n) can be thought of as a moduli space
of metric graphs, i.e. graphs equipped with metrics, considered up to
isometry.