ABSTRACT
In his talk, and the book it is based on (Rees 1997), Martin Rees argues that whether there are universes other than our own is a scientific question to which he suspects the answer is “yes.” To this I could agree, but only up to a point, the point being that there could be scientific evidence for the theories he mentions that postulate other universes. But Martin also has what I shall argue is a spurious non-scientific reason for suspecting that other universes exist, namely that he thinks they would make the fact that our universe supports life less surprising than it would otherwise be. Whether, without that anthropic support, we have enough reason to take these theories seriously I do not know.
