Mathematicians and engineers have teamed up to show how ultrasound waves can organize carbon particles in water into a sort of pattern that never repeats. The results, they say, could result in ...

Nick and Sally copy a sound pattern of buzzes and bells, to unlock a door. When a locked door plays a series of sounds, Nick and Sally try to repeat the sounds, to get the door to unlock. It works!

Remember the graph paper you used at school, the kind that’s covered with tiny squares? It’s the perfect illustration of what mathematicians call a “periodic tiling of space”, with shapes covering an ...