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The WIMP and the Dark Matter Hypothesis
The xenon experiment has for a while now been one of the best out there at ruling out parameter space for dark matter. If they are WIMPs, then there are dark matter particles around you flying through your body right now but not interacting very much. You build a detector which waits for those rare times when dark matter particles will interact with ordinary atoms and deposit some energy. And I haven't seen it yet. It's a very, very difficult thing to do because there are other things in the world that could bump into an atom and deposit someEnergy.