20 Reasons that the world could end

1. Asteroid impact
2. Global epidemics
3. Gamma-ray burst
4. Collapse of the vacuum
5. Rogue black holes
6. Giant solar flares
7. Reversal of Earth's magnetic field
8. Flood-basalt volcanism
9. Global warming 
10. Ecosystem collapse
11. Biotech disaster 
12. Particle accelerator mishap
13. Nanotechnology disaster
14. Environmental toxins
15. Global war
16. Robots take over
17. Mass insanity
18. Alien invasion
19. Divine intervention

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