Maybe, even within families, it's higher-IQ siblings who'd rather do non-reproductive stuff. Edit: Upon reflection, that's rather an ugly way to say it. And in

Maybe, even within families, it's higher-IQ siblings who'd rather do non-reproductive stuff. Edit: Upon reflection, that's rather an ugly way to say it. And in saying that, I was thinking of the well-established fact that reproduction rate is inversely related to educational level and so on.