The Ultimate Flat Tire

[MaliceDR]

First, look at this pic.

http://malicedr.onestop.net/SquareBike.jpg

Now that that's done, read this article.

http://www.macalester.edu/mathcs/SquareWheelBike.html

Time for that kid to turn his frown upside down!

[Evil_Koala]

To bad my sidewalk isn't made of catenaries.

[animeotaku99]

What the hell is up with those roads?