PhysicsCould gravity produce quantum entanglement if it’s not fully quantum? Upcoming experimental tests of gravity’s quantumness aim to resolve one of the biggest questions in physics, but theorists are finding that the issue may be even more complex than they thought ¿ìè¶ÌÊÓÆµ
PhysicsUltracold clocks could reveal how quantum physics alters time The world’s best clocks may be sensitive to an odd mix of quantum and relativistic effects that would stretch time and test the boundaries of physics ¿ìè¶ÌÊÓÆµ