Contagious Hysteria

In the winter of 1962, a single joke shared among schoolgirls in a remote boarding school triggered an event that defied all medical logic. What began as a ripple of giggles rapidly escalated into an uncontrollable, agonizing cascade of laughter that forced schools to close and paralyzed entire communities for months. How does a mere sound become a highly infectious pathogen?Contagious Hysteria me...