What was Darwin's point?

Hey, I have this on my right ear. Maybe. I have more of a notch than a bump, but I can see it being the same thing. Never gave it a thought, just aware of it when washing my ears, etc., right? Then one day, I'm sitting there, holding my hours-old firstborn, in awe while admiring the little miracle, checking her over, and before my mind actually registers the reaction, I see a little notch in her little ear, and realize my finger is already up to my own ear's familiar notch. Hard to explain the feeling. Dad bonding. :D