Science-fiction is a genre that imagines the future. It doesn’t necessarily predict the future (after all, where are flying cars?), but it grapples with the technological and societal changes happening today to better understand our world and where it’s heading.

So, what does it mean when so much of our most popular science-fiction - The Handmaid’s Tale, The Walking Dead, and The Hunger Games - present bleak, depressing futures? Cory Doctorow might just have an answer. He’s a blogger, writer, activist, and author of the new book “Walkaway,” an optimistic disaster novel.