Medicine: From Leeches to Lasers

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Across
  1. 4. inserting needles in a body to treat illness
  2. 8. teenager
  3. 15. resemblance; correlation
  4. 18. deathly; disastrous
  5. 19. common; demeaning; humble
  6. 20. exceptional; extraordinary
  7. 21. forever
Down
  1. 1. obvious
  2. 2. a worm that sucks blood
  3. 3. medical specialist
  4. 5. finished; confirmed
  5. 6. Greek "father of medicine"
  6. 7. drainage; waste
  7. 8. study
  8. 9. complicated or make detailed, expand
  9. 10. define action to be taken
  10. 11. cleanliness; hygiene
  11. 12. stale; rotting
  12. 13. painful
  13. 14. unhappy
  14. 16. empty
  15. 17. identify problem