I beleive that our Planet Earth has been visited by aliens for quite a no. of times. I have recently finished reading the Book "Fingerprints of God" by Graham Hancock. It has made me beleive that the evolution of human beings from typical animals to the modern complicated species does not seems to be a natural pattern. I have the same opinion regarding evolution of life on earth. Earth has all life supporting system in it, but this not be a system where life once born and flruish. I maybe be on the wrong path regarding this but i need opinions from you all.I find very very rarely people downhere discussing these kind of topics.