Leah Broussard has looked in on one of the more-testable Dark Matter theories and nixes it. Here, the question is the 877.8 second lifespan of a free neutron. Give or take nine seconds. They last longer in a beam - as Turtle Island pointed out at the time last year. (Personally I'd wondered about Relativity, if the beam is some fraction of C.)
Anyway a serious theory (not by me) was that the neutron was doing what neutrinos do, flip from one sort to the other. In the (posited) "mirror" state they do not interact with such neutron-soaking material as our good buddy boron.
Broussard's team has rated this Ethereal-Plane thesis as "wrong". Boron will trap ALL the neutrons.
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