What is the world's sharpest knife?

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Tags

1. #razor
2. #glass
3. #sliver
4. #slicing
5. #obsidian
6. #three
7. #sharpest
8. #volcanic
9. #blade
10. #times
11. #sharper
12. #world
13. #flaking
14. #blades
15. #overkill
16. #these
17. #knife
18. #thinnest
19. #nanometres
20. #sandwich