Guest: Naomi Oreskes is professor of the history of science at Harvard University. Her books include, The Collapse of Western Civilization: A View from the Future, Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming, and her latest with historian of science and technology Erik Conway, The Big Myth: How American Business Taught Us to Loathe Government and Love the Free Market.