Three thought experiments involving “demons” have haunted physics for centuries. What should we make of them today?

The exploration of quantum information challenges objective reality, positing the universe as a hologram is explored through ...

Time travel has long lived in the realm of science fiction, but a growing body of physics research now argues that journeys into the past might fit inside known laws of nature without tearing ...

For more than a century, gravity has been the stubborn outlier in physics, perfectly described on cosmic scales yet refusing to mesh with the quantum rules that govern everything else. A growing camp ...