New discoveries that show evolution in action are causing some scientists to say that the first scientific supermodel has arrived. Biology is normally carried out within isolated specializations. Ecologists study one organism, molecular biologists another, while evolutionary biologists look over hundreds without probing too deeply into any particular one. But one tiny little fish, the threespine stickleback, proves that a combination of genetics, molecular biology, developmental biology and population studies, can bring insight into the fundamental question of how evolution occurs in nature. “The sticklebacks are a shining example of what can happen when you put all of these fields…