Bizarre!

Riding on square wheels
From Science News: Riding on Square Wheels.

A square wheel may be the ultimate flat tire. There’s no way it can roll over a flat, smooth road without a sequence of jarring bumps.

Stan Wagon, a mathematician at Macalester College in St. Paul, Minn., has a bicycle with square wheels. It’s a weird contraption, but he can ride it perfectly smoothly. His secret is [continue, see photo]

From mirabilis_ca