I have to say I dislike the tone of your comment, it's unnecessarily argumentative, but the point about the Pioneer Fund is correct. I'm also concerned that the

I have to say I dislike the tone of your comment, it's unnecessarily argumentative, but the point about the Pioneer Fund is correct. I'm also concerned that there may be some selection bias in reports of separated twins with amazing similarities. Nobody is going to make a documentary about a whole set of separated twins that are completely different from each other, and we will naturally focus on similarities and ignore differences. Personally on the nature Vs nurture debate I think it's probably both, at about 50/50. I don't see how either of them can't have a significant influence.