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Weakly interacting particles are by definition hard to detect, because if they don't interact, how do you detect them? Some experiments are trying to detect them.
in many theories scientists predict the lighest supersymmetric particle to be stable and electrically neutral and to interact weakly with the particles of the Standard Model. These are exactly the characteristics required for dark matter, thought to make up most of the matter in the universe and to hold galaxies together. The Standard Model alone does not provide an explanation for dark matter. Supersymmetry is a framework that builds upon the Standard Model’s strong foundation to create a more comprehensive picture of our world. Perhaps the reason we still have some of these questions about the inner workings of the universe is because we have so far only seen half of the picture.