Need an icebreaker for your next dinner party? Here’s one you can share while nibbling hors d'oeuvres: “Did you know your skull and head is organized like an extinct jawless fish?” Take your philtrum, for example. That’s the groovy indentation on your top lip just beneath your nose.
You've probably never thought much about it, but your philtrum a clue to our shared ancestral past. It is evidence of your "your inner fish,” as paleobiologist and professor of anatomy Neil Shubin called it in his 2008 book of the same name.
