For the “Harry Potter” actors, the beauty of J.K. Rowling’s characters is that they grow and change so much over the course of the seven-part series.  Harry Potter started out as a young and somewhat confused orphan, but by “Harry Potter and the Half-Blood Prince” has become a confident young man on a mission.  Daniel Radcliffe, who’s been given the challenge of portraying the character’s evolution on the big screen, told us about the biggest changes in Harry Potter this time around. (CLICK ON THE MEDIA BAR BELOW TO HEAR DANIEL RADCLIFFE)