This week we're talking about personality tests. You know: those tests that ask you personal questions about your philosophy of life or your behavior or your ethics, and then tell you what kind of person you are. How much do they really reveal? And what does our desire to take them say about us? We'll be talking with a good friend of The Upgrade—and our first repeat guest—#1 New York Times best-selling author Gretchen Rubin. Gretchen is the author of the brand-new book “The Four Tendencies: The Indispensable Personality Profiles That Reveal How to Make Your Life Better (And Other People's Lives Better,Too).” Then we'll be joined by some of the Lifehacker staff to talk about our own results on a couple of popular personality tests: The Myers-Briggs Type Indicator, which uses Jungian theory to determine your personality type, and The Dark Triad Test, which purports to tell you how malevolent you are compared to the rest of the population. And producer Levi Sharpe takes to the streets to ask people what personality tests have (or haven’t) told them about themselves.

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