Bonus 1.6: Deborah Haarsma, The Multiverse [1]
String threory might be able to unify general relativity and quantum theory, which would enable scientists to describe the big bang. One of the implications of string theory is that their might be many other universes. However, there is no evidence to support string theory, and it is difficult to see how you would provide evidence. As such, string theory is interesting mathematical speculation, but not something anyone should worry about.