People used to think that the world was flat. Then new findings contradicted that. I agree that results from scientific studies are confusing, but I find that it is typically because the background knowledge isn't explicitly stated there to evaluate the findings. If you did a literature review of similar studies then you would be able to evaluate between two opposing arguments. Nobody has the time to do that and the job of conveying the information is supposed to be the science journalists, but I find that they often don't do that and instead focus on random or misleading points of the study so that it is attention grabbing. This is all IMO and I'll openly admit to being biased because I'm a grad student, an academic, and a scientist, but without studies like this an understanding of human behavior would be greatly lacking. Often times all the studies that don't seem to make sense are building the knowledge so that a larger conclusion can be drawn. You also need to have these developmental studies to add to the qualitative studies that focus on behavior. Nature versus Nurture should often be stated Nature and Nurture.
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It's not that simple. Why does one person "enjoy" doing such a thing and another not? Unraveling the cause behind the action is what scientists do. Not only is it fascinating work, but there are myriad applications that can better human life.
Thanks punk-a-doodle for such a cogent explanation of how certain parts of scientific research work.