This week we're talking with Tim Ferriss, author, podcaster, investor, entrepreneur, and self-proclaimed "human guinea pig." He's the author of several books, including the #1 New York Times bestsellers The Four-Hour Workweek and The Four-Hour Body and his latest, Tribe of Mentors. We talked with Tim about his most worthwhile investments and his biggest failures, his most valuable purchases under $100 and over $10,000, and what beliefs and behaviors have most improved his life.

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