I find this Venn diagram useful, as a rough definition: http://azahar.files.wordpress.com/2009/09/nerd-venn-diagram.jpg http://azahar.files.wordpress.com/2009/0

I find this Venn diagram useful, as a rough definition: http://azahar.files.wordpress.com/2009/09/nerd-venn-diagram.jpg http://azahar.files.wordpress.com/2009/09/nerd-venn-diagram....