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In respect of the "usefulness" of the Higgs field, I think that, based on previous experience, it is not yet possible to know whether or not it is going to lead to some kind of technology.
Faraday, the great pioneer of practical electricity, was once asked what was the use of all of his mucking around on a tabletop with magnets and wires and compasses. He is reported to have answered : "what is the use of a child?"
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