This is not pseudo-science. It is article reporting on real science. Suppose X is linked to Y... suppose male aggression is linked to reproductive competition.

This is not pseudo-science. It is article reporting on real science. Suppose X is linked to Y... suppose male aggression is linked to reproductive competition. Wouldn't you expect to see a graph like: http://media.economist.com/images/20081220/CXM534.gif http://media.economist.com/images/20081220/CXM534.gif http://media.economist.com/images/20081220/CXM534.gif http://media.economist.com/images/20081220/CXM534.gif ? How else would you explain it? What are your Y, Z and Theta? Science is all about fitting theories to facts. You can have your doubts but you can't just write it all off as "fun".