Here's a taste of Forbes' just-released annual philanthropy issue: A profile of Sam Walton's granddaughter, and how she aims to help reform public education.

"Anything to do with charter schools is a political lightning rod right now. As is pretty much anything to do with Wal-Mart and the family that controls the world’s largest retailer. Until now the personable [Carrie Walton] Penner has been hesitant to speak up. Her conversations with FORBES make up her first extensive media interview, and she speaks with the careful deliberateness of one of her charter school English teachers. Listen carefully, though, and you get a clear vision of the charter school movement over the next five years and her place in it, something that she’s been working toward, both consciously and unwittingly, over the past two decades." -- Luisa Kroll, Forbes.com