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For only the second time since the start of a global epidemic, a person was reported this month to have been cured of H.I.V., the virus that causes AIDS. Scientists and activists had almost given up on reaching that milestone. Here\u2019s a look at how we got to this point. Guest: Peter Staley, a longtime AIDS activist. For more information on today\u2019s episode, visit nytimes.com/thedaily.