It may or may not be inheritable, but I'm tempted to believe that it is "easily" teachable, especially to an unburdened mind not yet filled with the fallacies that school and sociological phenomena are so prone to encourage and reward. At the very least, it seems like the offspring of a rationalist parenthood is much more likely to become a rationalist themselves than the offspring of a single self-convincing pundit.
It's hard to disagree that it is teachable, not sure about the "easy" part. I wonder how one would measure it vs how easy it is to teach some other life skills.
Recently, LWers Will Ryan and Divia Melwani (now Will and Divia Eden) were married, with Eliezer Yudkowsky officiating.
I've been to 40+ weddings in my lifetime, and this was my favorite ceremony yet. Here is the video, and below is the transcript of Eliezer's... what's it called? "Blessing"?