As the Barbie movie has proved, the 64-year-old doll brand is just as vital and vibrant today as it was in previous generations. Even at a time when so many kids’ toys have been replaced by electronics, Barbie still fills a niche and continues to enjoy great success. Why? Margot Robbie, who both stars in and produced Barbie, told us she’s been pondering this question for a long time and has a few ideas. (Click on the media bar below to hear Margot Robbie)