The ability to precisely control how heat flows could lead to new cooling strategies for chips and high-performance systems. Credit: Carnegie Mellon College of Engineering Heat is something we encounter every day. A steaming cup of coffee gradually cools, a laptop warms up during use, and sunlight heats the Earth's surface. Yet when heat is examined at distances far smaller than the width of a human hair, it can behave in unexpected ways. Researchers from Carnegie Mellon University, working