Doomsday Clock 2025: Scientists set new time

The Doomsday Clock is a metaphor for how close the world is to being inhabitable for humanity. Scientists just set the new time for 2025.

​ The Doomsday Clock is a metaphor for how close the world is to being inhabitable for humanity. Scientists just set the new time for 2025. Read More Breaking News, Latest News and Videos | CNN