For roughly half a century, astrophysicists have treated the behavior of matter around supermassive black holes as a solved ...

For decades, physics has explained the transition from the quantum world to the classical world as a loss: coherence dissipates, superposition collapses, ...

Why do some changes in nature unfold gradually, while others occur in the blink of an eye? Rust forming on metal is a slow, steady process that takes days or even weeks to become visible. By contrast, ...