Are Bionic Superhumans on the Horizon?

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Across
  1. 3. artificial body part
  2. 5. not moving or motionless
  3. 6. a critical part of something or idea
  4. 8. to form a theory or opinion without firm evidence
  5. 10. having honest or moral principles
  6. 11. to insert or fix, especially in one's body through surgery
  7. 13. to increase in quality or improve
Down
  1. 1. not necessary
  2. 2. to express an idea clearly
  3. 4. a set of opinions or offering an explanation on a topic
  4. 7. a group of interconnected people or things
  5. 9. an electromechanical artificial body part
  6. 12. to remove