How do you tell the difference between a prophet and someone experiencing a delusion? This week, Frank and Dan explore the uneasy intersection of religion and mental illness, asking how believers decide whether a voice in someone's head is divine revelation or a symptom of psychosis.

Also this week: the Vatican excommunicates hundreds of traditionalist Catholics, a Mormon general authority apologizes after racist remarks about African American spirituals, Christian missionaries descend on Trump's sparsely attended America 250 celebration, FLDS leader Samuel Bateman is convicted on additional child abuse charges, scientists create a synthetic cell that can grow and divide, and the San Francisco Archdiocese agrees to a $395 million clergy abuse settlement.

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