Zeeya Merali is a freelance science writer and author of A Big Bang in a Little Room: The Quest to Create New Universes. Her work has appeared in Nature, Scientific American, Discover, Science, New Scientist, and on the BBC. She has also published two textbooks with National Geographic and has worked on NOVA's television series The Fabric of the Cosmos. She has a PhD in theoretical cosmology and lives in London. Artwork illustrating the concept of an alternate ‘bubble’ universe in which our universe (left) is not the only one. Some scientists think that bubble universes may pop into existence...