Vanity Fair goes inside Colombia’s hostage war. From Psychology Today, coddled from infancy and raised to be academic machines, China's only children expect the world — now they're buckling under the pressure of their parents' deferred dreams; and why are millions of Japanese youths hiding from friends and family? A review of How Sadness Survived: The Evolutionary Basis of Depression by Paul Keedwell. A review of Clean: A History of Personal Hygiene and Purity by Virginia Smith and The Dirt on Clean: An Unsanitized History by Katherine Ashenburg. A review of Sensory History: Seeing, Hearing, Smelling, Tasting, and Touching in History by Mark M. Smith. A review of books on loneliness. Tom Davis Gives Up: He was a star in the Republican Party; now, like dozens of his G.O.P. colleagues, he’s quitting Congress, fed up with his party, his president and the process. A review of Right is Wrong by Arianna Huffington and Why We're Liberals by Eric Alterman. A review of The Race between Education and Technology by Claudia Goldin and Lawrence Katz. An excerpt from Enemies of Intelligence: Knowledge and Power in American National Security by Richard K. Betts. A review of Buying In: The Secret Dialogue Between What We Buy and Who We Are by Rob Walker (and an interview).