From PBS NewsHour.

Can conspiracy theorists be shaken from their firm — and unsubstantiated — beliefs? Podcaster Zach Mack wanted to find out, so he turned to someone he’s debated about conspiracies for years: his father. He tells what happened in “Alternate Realties,” a three-part podcast from NPR. Mack and science writer David Robert Grimes join John Yang to discuss.

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