Q&A: Facebook's Sheryl Sandberg

On May 1, 2015, while vacationing in Mexico, the husband of Sheryl Sandberg, the chief operating officer of Facebook, died suddenly; Dave Goldberg was just 47. Then known for her bestselling 2013 book "Lean In," which urged women in the workplace to stand up for themselves, Sandberg unexpectedly found herself confronting her toughest challenge, as a single mother of two young children. In an emotional and wide-rangi…