(L-R): Anderson Cooper, filmmaker Liz Garbus and Gloria Vanderbilt in “Nothing Left Unsaid.”
(L-R): Anderson Cooper, filmmaker Liz Garbus and Gloria Vanderbilt in “Nothing Left Unsaid.” Mark Schafer/HBO
(L-R): Anderson Cooper, filmmaker Liz Garbus and Gloria Vanderbilt in “Nothing Left Unsaid.” Mark Schafer/HBO

What to Watch on Thursday: Anderson Cooper’s doc on mom, Gloria Vanderbilt

December 29, 2016 06:00 AM