By Walt Hickey Welcome to the Numlock Sunday edition. This week we’re joined by Wellesley College historian Kellie Carter Jackson, who along with Leah Wright Rigueur is the host of the brand new podcast Oprahdemics. Longtime readers know I’m fascinated by pop culture’s impact on society as a whole, and there are very few people who have had a more substantial, direct impact on American life than Oprah Winfrey. So when I heard about this podcast, I was instantly hooked on the idea of two historians sorting through the colossal legacy of Oprah Winfrey.