An underground detector in South Dakota has picked up an unusual signal that may be a sign of dark matter—the invisible, hypothetical substance estimated to account for roughly 85 percent of all matter in the universe.While researchers from the LUX-ZEPLIN (LZ) dark matter experiment emphasize they are not officially claiming a discovery, the observation could mark a major milestone in detecting the hidden framework of the cosmos."It could be the first hint of a dark matter observation," Sam Erik...
