This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...

We experience the flow of time because it’s a natural outcome of the basic laws of physics. But we may need to build a whole ...

Cosmology has a way of turning everyday certainty inside out, and few ideas do it more brutally than the suggestion that your ...

Gravity is supposed to be the most familiar force in nature, yet at the deepest level it remains the least understood. A bold new line of research now argues that gravity is not fundamental at all, ...