[meowmeow]

our tendency towards a larger brain has been stopped only by the fact that the human birth canal cannot open any further to accomodate a skull larger than we have now.

Interesting - so women's birth canals will never evolve to accommodate bigger heads. Evolution is so sexist. I guess I'll never get that 3rd arm I've been wanting.

[gcruse]

Interesting - so women's birth canals will never
evolve to accommodate bigger heads.

I don't see how unless there are mutations where
a wider canal coincides with a bigger brain/head.
But, I really don't understand everything I know :)