Heat is not supposed to behave like this. In everyday life, warmth seeps and diffuses, spreading from hot to cold in a slow, smearing process that never looks anything like a crisp sound wave. Yet ...

Step inside the strange world of a superfluid, a liquid that can flow endlessly without friction, defying the common-sense ...

More than 200 years ago, Count Rumford showed that heat isn’t a mysterious substance but something you can generate endlessly ...

Earth is taking in more energy than it releases back to space—a growing "energy imbalance" that is fueling global warming. A ...