Gotta disagree with the darwin thing!
It's not survival of the fittest anymore, it should be Survival of the most adaptive. with the world constantly changing, if a species doesn't adapt it, doesnt matter how fit they are, sooner or later something will adapt and eat it! :-) just my thoughts on the matter.
Survival of the fittest really means "more adaptive will survive". Don't confuse the term with being "physically fit".
From Wikipedia for the lazy: Darwin meant it as a metaphor for "better designed for an immediate, local environment", not the common inference of "in the best physical shape".
Lol thanks for the wikipedia quote, i still think my point is valid though ;-) if you go down the darwin route you need to explain to the youth of the UK today just what a metaphor is let alone who darwin was and his theories :-) lol its like opening a can of worms (is it just me or are young people getting stupiderererer?) I need to go back and re-read my dawkins books :-) i found some of his insights fascinating (In particular "The greatest show on earth" but maybe The God Delusion because it was fun! )
(also on the wikipedia front, we were always told not to use Wiki as a research tool because it was far to easy to change the data on there to anything you liked! lol The good old days of my IT courses before wiki had enough people to moderate updates properly :-) )