Great, this article's title suggests that they've discovered a selective pressure on the Dutch to be taller, but then says they have no idea what that selective

Great, this article's title suggests that they've discovered a selective pressure on the Dutch to be taller, but then says they have no idea what that selective pressure might be. At the very end of the article, even: > Dr. Govindaraju said it was too early to speculate on why some populations are evolving in different ways. Wtf?