An Alien's Guide to Conquering the Earth Naturally

An Alien's Guide to Conquering the Earth Naturally : Discovery News: "Devious sci-fi aliens have hatched many plots to conquer humanity, from the Machiavellian Martians of "The War of the Worlds" books to the current hit movie "Oblivion." However, the invaders' ambitions frequently fail, perhaps because nature has already tried many of these assaults on us or other species."