Fentanyl is 50 times more potent than heroin and can now be purchased online and delivered like your Amazon order. Scott Pelley reports. Frontotemporal dementia -- or FTD -- is the most common and most devastating forms for dementia. As Bill Whitaker tells us, the cause of the illness, which effects many Americans under the age of 60, remains unclear. Anderson Cooper introduces us to Mark Bradford, an abstract artist who tackles complex social and political issues. Those stories on tonight's "60 Minutes."
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