The Long Earth: Terry Pratchett and Stephen Baxter

Sir Terry Pratchett and Stephen Baxter discuss their new series of novels entitled The Long Earth. Part 2/3 The Ri is on Twitter:   / ri_science   and Facebook:   / royalinstitution   and Tumblr:   / ri-science   Our editorial policy: http://www.rigb.org/home/editorial-po... Subscribe for the latest science videos: http://bit.ly/RiNewsletter #TheLongEarth, #TerryPratchett, #StephenBaxter, #ScienceFictionBooks, #FantasyLiterature