Are deception and secrecy categorically wrong? Or can they be a necessary means to an end? This hour, TED speakers share stories of going undercover to explore unknown territory, and find the truth.

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Tags:  TED radio hour,  racism,  Dark Web,  Canadian Intelligence Service,  Theo E.J. Wilson,  Jamie Bartlett,  Mubin Shaikh,  Shabana Basij-Rasikh,  Taliban,  islamic extremism,  girls education,  Kabul,  technology,  activism,  Internet