N.15 A tenth of a googol in universes

There is an oft-cited story going around that the many worlds inter­pretation implies the existence of 10$\POW9,{99}$ worlds, and this number apparently comes from Everett, III himself. It is often used to argue that the many-worlds inter­pretation is just not credible. However, the truth is that the existence of infinitely many worlds, (or practi­cally speaking infinitely many of them, maybe, if space and time would turn out to be discrete and finite), is a basic requirement of quantum mechanics itself, regardless of inter­pretation. Everett, III cannot be blamed for that, just for coming up with the ludicrous number of 10$\POW9,{99}$ to describe infinity.