As an MD, soon to have a PhD in oncology immunology, I always wonder what project Google could be working on in this area. After all they are a company and most probably try to develop products that will yield a return in the future. So why would someone chose to work for a Google firm that has no real track record in the Life Sciences versus the many life-science companies that already have amazing logistics/experience in place (Novartis, Biogen, Takeda to name just a few in Cambridge, MA). Outside "data-science" projects like genomics, or very technical project like lab-on-a-chip devices, I wouldn't see a big advantage moving to the bay area. However, I guess offering huge salaries always helps convincing people to join your company. And the winters in the Mountain View are probably warmer than the Boston area.