Though it seems like it was just yesterday to many “elder millennials,” it’s been 20 years since the horror boom that brought us “Saw,” “Hostel,” and many other bleak, gore-soaked slaughter fests.  How did these films reach the heights of mainstream popularity for a good 10 years? Author Ariel Powers-Schaub’s debut book “Millennial Nasties: Analyzing a Decade of Brutal Horror Film Violence,” answers that question.  Powers-Schaub chronicles and analyzes the films of the time period, while showing how America popularized the brutality it exported on a global scale.  She spoke with us about writing the book, her hopes for the genre, and how the moniker of “torture porn” doesn’t do enough to describe the films we’ve come to love.