Nuclear bombs in suitcases, anthrax bacilli in ventilators, avian flu, and scorchingly hot temperatures: nightmares that were once the plot of Hollywood movies are now frighteningly real possibilities. How can we steer a path between willful inaction and reckless overreaction? Cass Sunstein examines these issues in his new book,...

Paul Wolfowitz, U.S. deputy secretary of defense and a leader in neoconservatism, challenges Europe to back the spread of democracy and explains why America is not an empire.