Occasionally, mysterious crop circles pop-up around the world; but in this case, there's no mystery. NASA collaborated with seven large "Space Farms" across the USA to design and build corn mazes to show off designs celebrating NASA's space achievements. For example this year alone NASA celebrated the 50th anniversary of the first American in space, the 30th anniversary of the first Space Shuttle mission and the 20th anniversary of the Hubble Space Telescope. The group is also working to schedule astronaut visits and hosting a national contest where winners can be voted "best maze" to earn a visit to Kennedy Space Center. Go to www.spacefarm7.com and vote for your favorite maze.