Pseudoscience is "not" just an idea which is not accepted by the mainstream scientific community. It is an idea which no kind of evidence is allowed to refute (prove wrong). Despite the fact that the word pseudoscience means "false science", it is the "openness to testing" which is fundamental to science. This is more fundamental than whether a theory is accepted. After all, ideas have been proved wrong, though once they were believed to be true. Obviously, at any given time, there are things which science has got right, and things which are uncertain or wrong. "Openness to correction" is the clear difference between science and pseudoscience.