Square wheels rolling smooth

This unusual trike proves that square wheels can roll smoothly over a row of inverted catenaries (a series of half-circles, to you and me). It was built by professor of mathematics and computer science, Stan Wagon.

If you want to try it out you’ll need to head over to Macalester College, where any vistitors can hop on and have a go. The odometer shows that it covers just over 15 miles each year.

But how could this ever be useful? According to the college website, it may have made life easier for ancient Egyptians. Continue reading