The development of artificial intelligence is speeding up so quickly that it was addressed briefly at both Republican and Democratic conventions. Science fiction has long theorized about the ways in which machines might one day usurp their human overlords. As the capabilities of modern AI grow, Paul Solman looks at the existential threats some experts fear and that some see as hyperbole. Watch PBS News for daily, breaking and live news, plus special coverage. We are home to PBS News Hour, ranked the most credible and objective TV news show. Newsletters: https://www.pbs.org/newshour/subscribe PBS News podcasts: https://www.pbs.org/newshour/podcasts Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG Find more from PBS News at https://www.pbs.org/newshour Subscribe to our YouTube channel: https://bit.ly/2HfsCD6 Follow us: TikTok: https://www.tiktok.com/@pbsnews X (formerly know as Twitter): http://www.twitter.com/newshour Instagram: http://www.instagram.com/newshour Facebook: http://www.pbs.org/newshour