From Index on Censorship, an interview with Ai Weiwei, star of the avant-garde, on challenging the status quo; and a look at how China’s online pioneers are pushing the boundaries of free speech. From Hoover Digest, Gary Becker, Richard Posner, and Niall Ferguson on on the subprime-mortgage meltdown. A review of Law and Irresponsibility: On the Legitimation of Human Suffering by Scott Veitch; and a review of Human Rights and Empire: The Political Philosophy of Cosmopolitanism by Costas Douzinas. Imperialism for Beginners: A review of Tycoon's War: How Cornelius Vanderbilt Invaded a Country to Overthrow America's Most Famous Military Adventurer by Stephen Dando-Collins. A review of The Constitution and America's Destiny by David Brian Roberston. Daydream achiever: A wandering mind can do important work, scientists are learning — and may even be essential. Machiavelli's daring gift: The Prince has elicited admiration, fear and contempt. A review of Sex in Crisis: The New Sexual Revolution and the Future of American Politics by Dagmar Herzog. From Lilith, political imperatives: Seven independent, Jewish and frankly feminist activists on what to do next. A review of Multiculturalism without Culture by Anne Phillips. An interview with Cass Sunstein on the Homer Simpson in all of us.