In some real-world settings, taxicab geometry is more convenient, and more relevant, than Euclidean geometry. Engineers use it when planning the most efficient paths for robots to take when navigating ...

Within this red circle lies one of the most extreme environments on our planet—the driest non-polar desert in the world. Known for its incredibly arid conditions, this desert experiences virtually no ...

But in 2014, NASA’s Terra satellite captured a near-perfect circle of clouds hovering above the Pacific Ocean. Spotted a few thousand kilometers southwest of Hawaii, this unusual ring floated ...

Several of the photographs have round subjects — wheels, domes — meaning, yes, circles within circles. A photograph of an old wagon hangs alongside a covered car. It’s not just early Kodaks ...