Correlation is not causation. It's a logical fallacy to state that "rejection reduces IQ" on learning that rejection correlates with a decreased ability to get high scores on IQ tests.
In the extreme case, it can be argued that it is philosophically impossible to establish causation beyond any doubt.
What I'm trying to say here is "correlation != causation"-type comments are boring. Everyone on this site already knows they aren't the same. It's like someone mentioning in every thread that the Web is not the same as the Internet.
