Author Matt Ridley is well known for his book "The Rational Optimist," which argued that the world is consistently getting better year after year. In the 15 years since that book was published, however, world events have convinced many people that the opposite is actually true. Matt Kibbe sits down with Ridley to discuss his next book project, in which he will update and reflect on his earlier conclusions to see whether there is still reason to be optimistic or if in fact it is rational to be a pessimist.