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Breakthrough in the nonlinear generation of primordial gravitational waves
https://phys.org/news/2022-01-breakthrough-nonlinear-primordial-gravitational.html
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A superheterodyne receiver for primordial gravitational waves.
Cool.
(Note: The article said that the researchers were "generating" primordial gravitational waves, which of course is not possible unless they also have discovered a mechanism for bidirectional temporal manipulation, which would be a much bigger story. :)
@Pat Well spotted!