In this talk, after a survey on known results concerning the $K(\pi,1)$ conjecture and homology of Artin groups, I will introduce a new result, that is a formula of the second mod 2 homology of an arbitrary Artin group, without assuming the $K(\pi,1)$ conjecture is true.

This is joint work with Toshiyuki Akita.

（いつもと日時と場所が違います。）