but what would you have them do? Hit small children and then track them when they're older? It's not perfect, far from it, but the researchers only have so much to work with. At some point in time, they are relying on personal accounts. Psychology experiments can't exactly fit the bill of most hands-on experiments because of all sorts of moral and time issues. Given what they have to work with, I think it was sufficiently designed. Certainly better than that stupid g-spot study