Across
- 7. press
- 8. experiment
- 11. reinforcement
- 13. curiosity
- 15. begin
- 16. include
- 17. automatically
- 19. existence
- 20. research
Down
- 1. invention
- 2. present
- 3. consequence
- 4. positive
- 5. purposefully
- 6. receive
- 9. period
- 10. press
- 12. unnecessary
- 14. influence
- 18. appear