"Some physicists solve that problem of the necessity of finely tuned physical constants ... by invoking the anthropic principle, saying, well, here we are, we exist, we have to be in the kind of universe capable of giving rise to us. That in itself is, I think, unsatisfying, and as John Lennox rightly says, some physicists solve that by the multiverse idea-the idea that our universe is just one of many universes."