It started with three schoolgirls in a classroom in 1962 and spread until it forced 14 schools to close and incapacitated over a thousand people. But this was not joyful laughter. The victims suffered crying fits, fainting, pain, rashes, and respiratory distress for days on end, and doctors who tested the water, food, and air found absolutely nothing biological.

This episode investigates how a single giggle became an 18-month epidemic, and what that staggering escalation reveals about the human brain under cultural upheaval. We explore the diagnosis of mass psychogenic illness, the competing theories behind it, and the broader pattern of behavioral epidemics across the region. It matters because it is a stark lesson in the inescapable connection between mind, body, and culture.

• How the outbreak hit 95 of 159 girls at a Kashasha b ...