“A hypothetical intelligent tapeworm might well consider itself blessed to have such a warm and comforting environment, that gives it all the food it needs and takes away anything that it excretes. And if it were of a philosophical bent, it might speculate: what is the extent of my environment? Is it infinite, or are there physical limits to it? And, eventually, are there other tapeworms out there? And finally, the brilliant polymath-level Enrico Fermi of tapeworms might ask, if there are other tapeworms, why aren’t they here?”