Humanity's final invention

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Across
  1. 1. — Build up gradually, often unnoticed at first.
  2. 4. — Tight or limited in width or scope.
  3. 5. — Connected to the system that processes thought.
  4. 6. — Came into view after being hidden for a while.
  5. 10. — Hidden ability waiting to be realized.
  6. 13. — Increasing at an ever-accelerating rate.
  7. 14. — Something that exists as a single, distinct unit.
  8. 15. — Inner reasons driving outward actions.
  9. 17. — Undermine authority from beneath the surface.
  10. 18. — Go beyond in quality, amount, or achievement.
  11. 19. — System of interconnected parts or people.
Down
  1. 1. — A step-by-step method for solving a problem.
  2. 2. — A cover that protects — literally or metaphorically.
  3. 3. — Fully grasp the meaning or significance of.
  4. 7. — Varied in kind; showing a range of differences.
  5. 8. — Sudden and dramatic burst or increase.
  6. 9. — Imagined rather than proven or factual.
  7. 11. — Change shape or nature completely.
  8. 12. — Broad, not specialized or detailed.
  9. 16. — Possible storyline for future events.