Directed energy weapons shoot painful but non-lethal beams: Are similar weapons behind Havana syndrome?

The latest episodes of so-called Havana syndrome, a series of unexplained ailments afflicting U.S. and Canadian diplomats and spies, span the globe. They include two diplomats in Hanoi, Vietnam—which disrupted Vice President Kamala Harris's foreign travel schedule—in August, several dozen reports at the U.S. Embassy in Vienna earlier this year, and a pair of incidents at the White House last November.

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