User blog:Milomilk/Why are they changing Bruce Banner's actor from Edward Norton to Mark Ruffalo

Why in the world did Joss Whedon change the Hulk actor from Edward Norton to Mark Ruffalo? It makes no sence. Why did he do it? He should have kept Norton because he kept everyone from the other movies. If the charactor got a face transplant then I understand. If not then what the flip is wrong with that guy! I meen I don't hate Joss. It's just... why?!