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Across
  1. 3. Air travel system
  2. 7. Being and Time
  3. 8. Divide in Europe
  4. 15. Superman theorist
  5. 17. Categorical imperative
  6. 20. Movement system
  7. 21. Stoic emperor
  8. 22. Calculus co-inventor
  9. 24. Space object orbiting
  10. 25. Political tension era
Down
  1. 1. Cold War competition
  2. 2. Leviathan author
  3. 4. Secret spying
  4. 5. Calculus co-inventor
  5. 6. Stoic philosopher
  6. 9. General will
  7. 10. Finding direction
  8. 11. Social contract
  9. 12. Cogito ergo sum
  10. 13. Spy operative
  11. 14. Old navigation tool
  12. 16. Candide author
  13. 18. Triangle man
  14. 19. Dialectic
  15. 23. Ethics author