Low-friction, high-stiffness ball guides support on one rail (top) or two (bottom). The trade-offs for this performance are higher cost and more noise. The shortest path between two points is a ...

Over the past century, archaeologists have uncovered more than 1,600 Proto-Elamite inscriptions, but only about 43 in Linear Elamite, scattered widely across Iran. Illustration by Meilan Solly / ...

Grade school math students are likely familiar with teachers admonishing them not to just guess the answer to a problem. But a new proof establishes that, in fact, the right kind of guessing is ...