The cellphones known as 5G, or fifth generation, represent the vanguard of a wireless era rich in interconnected cars, factories and cities.

Whichever nation dominates the new technology will gain a competitive edge for much of this century, according to many analysts. But a television network a few blocks from the White House has been stirring concerns about a hidden flaw.

"Just a small one," a TV reporter told her viewers recently. "It might kill you."

The Russian network RT America aired the segment, titled "A Dangerous 'Experiment on Humanity,'" in covering what its guest experts call 5G's dire health

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