Neutrinos are light-mass, fast-moving particles that don't interact with matter until they do, when the collision gives off so much energy that exotica like muons and pions appear. These decay at once, releasing photons which detectors detect.
So: here's KM3-230213, a "neutrino" detected in the Med. This released so much energy it overloaded a lot of the sensors. And it came from a direction whence nobody expects neutrinos, drilled through a lot of rock before hitting the ocean detectors, and no parallel neutrini were seen in the icy detectors of Antarctica.
Perhaps this was no neutrino. Perhaps it was a dark-matter particle. It's been getting harder to consider non-CDM solutions for wide-angle gravity.
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