There are some truths that we believe in wholeheartedly — but what if we’re completely wrong? Once we separate fact from fiction, how do our perceptions change?  In this hour, TED speakers move beyond conventional wisdom to reveal complex realities about what we think we know to be true. Author Malcolm Gladwell reveals an alternative account of David and Goliath that flips the story on its head. Reporter Jennifer 8. Lee talks about her hunt for the actual origins of Chinese-American food. Ecologist Allan Savory counters everything conventional wisdom tells us about how grasslands lose their life to desertification. Reporter Leslie T. Chang debunks how we assume Chinese factory workers feel. Psychologist Barry Schwartz says having more options doesn't make us happier — it actually paralyzes us.