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Sheryl Sandberg opens up about husband’s death in UC Berkeley commencement speech

"It is the hard days — the times that challenge you to your very core — that will determine who you are," Facebook COO Sheryl Sandberg said.

Facebook COO Sheryl Sandberg speaks during the Fortune Global Forum on Nov. 3, 2015 in San Francisco, Calif. (Photo by Justin Sullivan/Getty)
Facebook COO Sheryl Sandberg speaks during the Fortune Global Forum on Nov. 3, 2015 in San Francisco, Calif. Getty Images

Elisha Fieldstadt