Of course, this isn't conclusive proof. But it's worth recalling the ancient adage, variably attributed to Picasso or the writer Susan Sontag, that if you can imagine it, it must exist. And there might be something to it. After all, many individuals throughout history envisaged various kinds of a multiverse long before Hugh Everett sipped his sherry. For example, depictions of several parallel worlds may be found in ancient Indian religious scriptures [source: Sanskriti]. Wesleyan University religion professor Mary-Jane Rubenstein states in her book "Planets Without End: The Many Lives of the Universe" that the ancient Greeks had the Atomist school of thinking, which claimed that there were an endl