Conspiracy theories are not new. They’re as old as time itself. But if you feel like they’re everywhere right now, you’re not alone. So, what do you do when somebody you love has fallen down a rabbit hole? CNN’s Donie O’Sullivan has been covering the world of misinformation for more than a decade, but now he's less interested in what people believe than why they believe it. So, he’s trying to find out.

See more of Donie's interview with Dr. Samuel Veissière⁠ on YouTube.

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