Neutrinos stream out of the universe’s most violent engines and point straight back to their source — yet after a decade of hunting, only a couple of their origins are known. Now a deep radio survey offers a fresh clue: faint radio flares, most of them invisible to γ-ray and X-ray telescopes, may produce about 13% of the cosmic neutrinos IceCube detects. We explain the finding, and why a > 2σ hint is a sign to watch, not yet a discovery.
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 correlation between faint radio flares and astrophysical neutrinos, consistent with radio flares producing about 13% of them. Strikingly, some 90% of those flares are undetected in γ-ray and X-ray light. It is a hint, not a discovery — but future VLASS data could push it past 5σ.){kind=link}