Rebecca Saxe: How we read each other's minds. Paul Zak: Trust, morality - and oxytocin. Phil Plait: How to defend Earth from asteroids. Barry Schuler: Genomics 101. Philip Zimbardo shows how people become monsters ... or heroes. Wade Davis on endangered cultures. Daniel Wolpert: The real reason for brains. Eric Mead: The magic of the placebo. Ben Goldacre: Battling bad science. What we learned from 5 million books.