Acadmic Puzzle

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Across
  1. 3. four in Spanish
  2. 6. type of protest
  3. 11. quantity that has magnitude and direction
  4. 12. artificially high voice
  5. 14. tenth letter of the Greek alphabet
  6. 15. large, thick muscle on dorsal part of upper arm
  7. 16. leavening agent
  8. 18. the Emirates (acronym)
  9. 19. a ___ in one's cap
  10. 21. most commonly used gas in World War I
  11. 24. person of wide-ranging knowledge
  12. 25. duck, duck, ___
  13. 26. making the expression of an impulse socially acceptable
  14. 28. front teeth
Down
  1. 1. capital of Hungary
  2. 2. members of the working class
  3. 4. eighth element of the periodic table
  4. 5. city of the 2010 Winter Olympics
  5. 7. cat breed that can only be female
  6. 8. small white bumps on skin
  7. 9. popular Southern US dish made from ground corn
  8. 10. person who is new to a subject, skill, or belief
  9. 13. Look ___!
  10. 17. type of shoe cover to protect footwear
  11. 19. an exact copy
  12. 20. 500 sheets of paper
  13. 22. twin brother of Artemis
  14. 23. harmful, poisonous, or very unpleasant
  15. 27. stupid or contemptible man (UK slang)