Nanotech run rampant—aka, Eric Drexler’s “grey goo”—is one familiar example. Another is a pissed off AI waking up, hacking NORAD, and going DEFCON 666 on the entire world. There’s also genetically modified organisms overrunning ecosystems, cyberterrorists playing good night New York with the power grid, or biohackers playing goodbye San Francisco with weaponized Ebola. These are the horrors that go bump in the expo-tech night. And this is Bostrum’s dark point: We’re in for a bumpy ride.