The Rise and Fall of Artificial Intelligence

Some Silicon Valley types are sufficiently concerned about where their innovations may be taking us, that they're seriously imagining apocalyptic scenarios. A former Facebook manager has bought land on an island, and stocked up on ammunition. Others have bought underground bunkers, and have planes on constant standby in case society implodes. These preppers, by one estimate, include at least half the billionaires in Silicon Valley. Progress can be fragile. It's not always so straightforward to anticipate how new technologies will play out. Will artificial intelligence hugely widen inequality, should governments step in? How?