On the evolutionary biology/morality note, there was a good article in The Economist (March 2002) called "Deviation from the Mean" which talks about how altruism and sacrificing yourself to punish freeriders helps your genes to be transmitted and is therefore selected for in nature.
However humans have reached a post-evolutionary stage and a level of awareness that means we can't simply say that morality or ethics is biologically determined and therefore we only need to follow some sort of crude animalistic morality (live selfishly most of the time, but help defend the group when necessary and don't be seen to act out of line or we'll risk losing the group's protection).
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I've been 4thTimeLucky, you've been great. Goodnight and God bless!
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