5-year Havana Syndrome investigation finds new evidence of who might be responsible

News Snapshot:

This week on 60 Minutes, Scott Pelley and a team of producers continued their five-year investigation into Havana Syndrome, the phenomenon of mysterious brain injuries to U.S. national security officials and diplomats, and their families, both abroad and at home, that in some cases have led to major health conditions, like blindness, memory loss, and vestibular damage. This fourth installment brought major developments to the story: a suspected link between attacks in Tbilisi, Georgia and a top-secret Russian intelligence unit, and new evidence that a reliable source calls "a receipt" for acoustic weapons testing done by the same Russian intelligence...