Bill Whitaker goes behind the scenes of cyber assaults on U.S. voting systems. Oprah Winfrey reports on a monument dedicated to the thousands of African Americans who have been lynched. Dr. Jon LaPook sits down with a couple, of which the wife has Alzheimer's disease. "60 Minutes" has interviewed them yearly for the past decade to illustrate the disease's impact. Those stories on tonight's "60 Minutes."
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