My husband and I don't really parent differently. We tend to be on the intellectual side so there are a lot of those pursuits in our home. We also travel frequently and explore new things, we have always felt like these things are important. I wonder if that might be why we never thought of our daughter as gifted until she started school? I do advocate more actively for her formal education now as when she started I took a more hands off approach. I tend to believe environment has a lot to do with IQ though (I know that not everyone does) so perhaps the environment is one of the reasons DD tests well (who knows) ??