Remember the Spirograph toys you had when you were a kid, which let you draw mathematically precise hypotrochoids and epitrochoids (or, as I called them, “neat shapes”) without cracking a sweat? What ...

It’s long been accepted that the smoother the surface, the lower the aerodynamic drag. That turns out not always to be the case. The Coyl uses a coil design for the power cable, keeping it neat and ...