Atomic Clocks Knock at Dark Matter's Door

Every minute of every day, over a dozen dark matter detectors across the globe lie patiently in wait -- their bellies filled with ultra-pure liquid that is hungry for a dark matter particle.Dark matter particles should, in theory, interact with the liquid inside of these detectors, leaving behind a unique signature. But what if dark matter is not comprised of particles? A pair of theorists is considering the possibility. In particular, they are looking at a type of defect in space that might hav...