This edition: Must Multiple Universes Exist?
First aired: October 27, 2015.
Of all human knowledge, the most stunning may be multiple universes-very many universes, perhaps an infinite number of universes. Are multiple universes-the 'multiverse' - scientific fact, theory or speculation? With Alexander Vilenkin, Alan H. Guth, Raphael Bousso, Max Tegmark, Don Page and Paul Davies.