The question has been asked many times by many people: "Why would every government in the world ignore everything they hate about each other to conspire together to make us all believe that the Earth is round, with no evidence of any possible gain on their part?". The answer is simple; Reptoids!
Reptoids are shape-shifting lizards that theoretically live beneath the Earth's crust and have infiltrated different levels of our society. They have only been heard of by a few people, and are detectable by fewer still. These Reptoids have shape-shifted into human form long ago, surfaced in various parts of the world and infiltrated governments while they were weak, or have taken the place of reputed scientists. From there, they could easily insitute the education of the youth. For hundreds of years people have been learning about the round Earth from Reptiods and took it as truth. When they teach it to others, it's not because they are part ofa government consiracy, but rather have been misled by shape-shifting lizards!
Why would the Reptoids want us to think the Earth was flat? Purely and simply because they DO live beneath the crust, and so long as people think that they can't travel farther than a few kilometers before having their drills melt from the mantle's heat, they won't search for the Reptoids' cities! If people found it, the conspiracy would be blown open and then the Reptoids would be defeated forever.
I suggest you go to
http://groups.myspace.com/RRG to see more.