As you may know, December 21, is the last day in the Mayan calendar. Many people have interpreted that as a sign of the apocalypse, our last day on Earth.
But even if the world doesn't end today, that doesn't mean we're off the hook. There are plenty of doomsday scenarios still left and our next guest makes it his life's work to think about them.
Stuart Armstrong, a research fellow at the Future of Humanity Institute at the University of Oxford, joins the show to explain the top five ways the world might actually end:
1) Synthetic biology
2) Nuclear war
3) Artificial intelligence
4) Pandemics and plagues