Is Obsidian the sharpest?

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  1. #produce
  2. #angstroms
  3. #nanotechnology
  4. #steel
  5. #times
  6. #glass
  7. #scalpels
  8. #cutting
  9. #consider
  10. #household
  11. #finer
  12. #obsidian
  13. #blades
  14. #materials
  15. #volcanic
  16. #still
  17. #edges
  18. #sharpest
  19. #razor