What does midnight mean on the Doomsday Clock?

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Tags

1. #include
2. #currently
3. #catastrophe
4. #members
5. #might
6. #climate
7. #doomsday
8. #maintained
9. #nuclear
10. #symbol
11. #bulletin
12. #global
13. #clock
14. #change
15. #scientists
16. #represents
17. #likelihood
18. #midnight
19. #minutes
20. #atomic