What is ‘Havana Syndrome’, what does the latest report say about the mysterious illness?

GS Paper 2 Topics Covered: Issues related to health.   Context: Nearly four years ago a mysterious neurological illness, referred to as “Havana syndrome”, started to afflict American diplomats and intelligence operatives in Cuba, China, and other countries. Now, a report by the National Academies of Sciences (NAS) has found “directed” microwave radiation to be its …