Growing up in Miami, Fla., Sheryl Sandberg was always at the top of her class. In middle school, she beat high schoolers in a debating contest, and later enrolled at Harvard. After working in government and then at Google, Sandberg joined Facebook. As chief operating officer, she helped lead the social media company to profitability. In a new book, Sandberg writes about her journey to the top of Silicon Valley while balancing a family. She says women hold themselves back from reaching leadership positions and should take more risks. Diane talks with Facebook COO Sheryl Sandberg about why women should “lean in” to their careers.