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In 2013, Melissa Bumstead’s four-year-old daughter was diagnosed with a rare and aggressive form of leukemia. While at the Children’s Hospital in Los Angeles, she noticed that there were many other families with children with cancer who lived very close to her in California’s San Fernando Valley. A new MSNBC Films documentary, “In the Dark of the Valley,” chronicles Bumstead’s journey to learn those families are all living straight downhill from a nuclear research lab. Melissa Bumstead joins Joy Reid to share her experiences. You can watch ‘In the Dark of the Valley’ this Sunday night at 10pm ET on MSNBC.Nov. 11, 2021