This is what Carl Sagan had to say about crop circles: Click here - This scientist was one of the directors of early Mars missions and of the Voyager I and II projects, thanks to which we acquired more knowledge than ever in history, about the Solar System. He was also in charge of all the research on extraterrestrial life at Cornell Univ. for many years. He was also author of the most famous TV scientific series: Cosmos, and many books.

Un abrazo - Andrés