The titel has a typo as the actual article has the title "The Social Edge of Intelligence".
I've corrected the typo now, but I almost let it stand as a testament to my humanity.
Yea no worries, just wanted others to know since when I typed the comment, the submission was quite fresh. It was my hope that it would make less people confused.
I didn't mind that there was a typo.
I assume most readers could decipher that typo, but I recognize your need to be pedantically correct as part of the grand tradition of HN.