The modern United States runs on an invisible machine of wires, transformers, data centers, and control rooms. If that ...

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

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, ...