That's Just How We Roll

Getting a satisfactory glide -- or any movement at all -- on a trike with square wheels seems impossible. That's the kind of challenge designers of MoMath love. "The power of mathematics allows you to discover a way that you can do the seemingly impossible and make it possible," says museum founder and exec director Glen Whitney. So how does it work? The "wheels" skim over a rolling, ridged surface that rises and falls with the shape of the wheels. Hence, both trike and rider stay at the same height.