The Unbelievers

As they barnstormed the globe to promote the importance of science and reason to packed lecture halls, a pair of renowned and unapologetically atheistic scientists─evolutionary biologist Richard Dawkins and cosmologist Lawrence Krauss─contended with their admirers as well as their critics, as documented in this provocative chronicle offering testimonials from influential supporters. 77 min. Widescreen; Soundtrack: English Dolby Digital 5.1; deleted scenes; interviews; featurette; theatrical trailer. Two-disc set.