Book excerpt: In How to Humble a Wingnut, leading constitutional scholar, behavioral economist, and former Administrator of the White House Office of Information and Regulatory Affairs Cass R. Sunstein examines the unconventional impetuses behind human decision-making. Why it is that people often choose to behave so strangely? Sunstein’s incisive commentaries point to recent empirical findings to demonstrate how and why people convince themselves they are right despite evidence to the contrary; fear dangers they are unlikely to encounter; and ignore real risks. Mining developments in recent behavioral studies for tips on everything from holiday shopping and political biases to staying healthy and clear thinking in general, Sunstein nudges his reader towards that rarest of grounds—understanding.