As real as the neutrino. The neutrino was a prediction based on a model of physics at the time and remained theoretical for thirty years until an experiment confirmed their existence. Like the Higgs, it was thought to be nearly impossible to experimentally verify for a very long time. And when it was observed, it was not observed directly, but through the behavior of particles it interacted with. The interacting particles, in order to behave as they did, must have interacted with something that had the precise qualities ascribed to the neutrino. Therefore, a neutrino must have interacted with them. Therefore, neutrinos exist.
Now we have hot and cold running neutrinos and can use them to probe all sorts of interesting things. But we have still not directly observed them in a detector, because, by their nature, they don't show up. But we know that when we see particles behaving as if they interacted with a near massless, half spin object interacting weakly, we call it a neutrino and move on.
meredith kercher meredith kercher waxahachie waxahachie erin burnett four loko michael savage
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