This month's episode is about mass psychogenic illness, more commonly known as mass hysteria. We primarily focus on 2 examples from history, specifically the Dancing Plague as well as some instances of hysteria in religious institutions in the 16th century. We also cover a few modern examples just to show that this phenomenon can still happen and that it can take rather mild forms, so it doesn't always look like the 'typical' dramatic mass hysteria event.

The image is a portrait of a 16th-century nun in Poland, by Jadwiga Radomyski.

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