In the elusive hunt for dark matter, some researchers are looking underground. The mysterious, unseen substance makes up more than 85 percent of the material in our universe. And since dark matter doesn’t interact much with normal matter (that’s what makes it “dark”), scientists usually rely on extremely large detectors to maximize their chances of observing a signal. But the physical hunt for dark matter is relatively new, so these experiments have only been running for a few years.

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