Across
- 2. railroads
- 4. maintain utility infrastructures
- 5. test new products
- 6. bridge
- 9. higher powered x-ray machines
- 15. highways
- 16. robots
- 17. sail
- 18. cell phones
- 19. mobile apps
- 20. aquarium
Down
- 1. water turbine
- 3. vaccines
- 7. cotton gin
- 8. laser surgery resulting with less bleeding
- 10. airplanes
- 11. wide streets
- 12. stove
- 13. jet engine
- 14. nuclear reactor