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Across
  1. 2. Space explorer
  2. 5. Motor vehicle
  3. 10. Heart listener
  4. 11. Vision correction
  5. 14. Flying machine
  6. 18. Strong metal
  7. 20. Illumination invention
  8. 21. Diabetes cure
  9. 22. Voice transmitter
  10. 23. Immunization tool
  11. 24. Star gazer
  12. 25. Building material
Down
  1. 1. Music recorder
  2. 3. Cooling technology
  3. 4. Tiny processor
  4. 6. Temperature controller
  5. 7. Sound amplifier
  6. 8. Visible energy
  7. 9. Astronomical tool
  8. 12. Bacterial medicine
  9. 13. Ancient remains
  10. 15. Communication wave
  11. 16. Nuclear energy
  12. 17. Small object viewer
  13. 19. Digital network