A head start doesn't always ... well, help you get ahead. With examples from sports, technology and economics, journalist David Epstein shares how specializing in a particular skill too early in life may undermine your long-term development -- and explains the benefits of a "sampling period" where you try new things and focus on building a range of skills. Learn how this broader, counterintuitive mindset (and more forgiving timeline) could lead to a more fulfilling life, personally and professionally.