What this story makes me think, as a biologist, is just how arbitrary human nature is. We humans didn't not have to evolve the way we did. There were an unlimited number of possibilities. We think that our body form and our mind are somehow ideal or sacred, but in fact we could just as easily have evolved to have two heads, if it had been advantageous to have two heads (sexual selection, anybody
) In a way it's a testimony to the unlimited possibilities the human species contains.
Be sure to check out the picture linked to this article. This girl had a separate head attached to her head, and this separate head could blink and smile.
Quote:
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Video footage provided by the hospital, a national center in Egypt for children's medicine, showed Manar smiling and at ease in a cot with the dark-haired "parasitic" twin, attached at the upper left side of the girl's skull, occasionally blinking.
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UNBELIEVABLE.
This is one of those things you have to look at over and over again to make sure it's not an Onion article. . .
http://story.news.yahoo.com/news?tmp.../egypt_baby_dc