BRUCE BANNER: Inside the huge green guy who loves to smash, there is the shy and soft-spoken Dr Banner who loves to read. He had fled the United States, but when a mounting threat called for Banner's specialized scientific expertise, S.H.I.E.L.D. recruited him, knowing full well that the incredible strength of Banner's alter-ego, Hulk, would be an additional asset to the Avengers. Tony Stark might know a lot of stuff as well, but unlike him, the physicist inherited nothing substantial. Whatever he knows, he earned it with handwork and non-stop reading. (Photo | AP)