Big Bang Theroy

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Across
  1. 1. Sitting on top of
  2. 3. Leonard studies in his science
  3. 4. Leonards love interest
  4. 5. A computer log
  5. 7. generally well known
  6. 10. lives with his mother
  7. 12. Science term for the centre of an object
  8. 15. is enough/acceptable
  9. 16. A group of nerve cells
  10. 17. Being used by somebody
  11. 18. Flatmate of Sheldon
  12. 19. A form of particle
Down
  1. 1. Particle studied in science
  2. 2. A character who is particular about everything
  3. 6. Study and writing of a subject
  4. 8. A word Sheldon often uses
  5. 9. Lots of work
  6. 11. friend who can't talk to women without a drink
  7. 13. A tiring walk
  8. 14. also home of superman