I really am fed up of the whole 9/11 truth debate thing, but there was one thing I could never answer, because I am so ignorant of modern history. Whenever you mention the fact that the alternative conspiracy theory would involve 1000s of people, and there's no way they can keep that a secret because even secrets involving a very small number of people have got out, the question I always get is "ah, but what about the Manhattan project?"
Is there a good counter-argument to this?
Is there a good counter-argument to this?