U.S. diplomatic personnel stationed in Havana, Cuba first reported it more than five years ago: a piercing, high-pitched sound, often followed by headache, nausea, and vertigo.  Since then, such incidents have been reported all over the world, including in our nation’s capitol.  To date, the U.S. government has no good explanation for the strange phenomenon known as Havana Syndrome.  Mark and Joe examine this unsolved mystery and run through possible causes. (Recorded January 21, 2022.)