Snakes on a Plane and short film parody competitions. On July 6, 2006, the official "Snakes on a Plane" website started a promotional sweepstakes called "The #1 Fan King Cobra Sweepstakes". The contest made innovative use of the publicity-generating potential of the Internet, requiring contestants to post links on forums, blogs, and websites and collecting votes from the users of those sites. Many of the early fan-made trailers and later other viral videos and commercials circulated via YouTube, and captured media attention there with such titles as: "Cats on a Plane" (which was featured in Joel Siegel's review of "Snakes on a Plane" on
Aperiodic set of prototiles seen on the list of aperiodic sets of tiles. The underlying undecidability of the domino problem implies that there exists no systematic procedure for deciding whether a given set of tiles can tile the plane. Polygons are plane figures which are bounded by straight line segments. Regular polygons have all sides of equal length as well as all angles of equal measure. As early as AD 325, Pappus of Alexandria knew that only 3 types of regular polygons (the square, equilateral triangle, and hexagon) can fit perfectly together in repeating tessellations on a Euclidean plane. Within that plane, every triangle,