Contagious yawning is a mystery!!

I just want to know WHY...why hasn't science been able to figure this one out yet? ...Anyway,this is a pretty interesting article about some discoveries in this regard.

So what gives? In an effort to find the answer, the Finnish government recently funded a brain scanning study. The results turned up some hard-to-interpret, possible clues. It also confirmed the obvious: yawn contagion is largely unconscious. Wherever it might affect the brain, it bypasses the known brain circuitry for consciously analyzing and mimicking other people's actions. [more]http://www.world-science.net/exclusives/050309_yawnfrm.htm