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Across 2. Incapable of being passed through or penetrated. 3. Predication or plan for the future. 7. Annoyed; irritated 9. Willingness to try new things; ambition to take the lead. 11. Many and varied. 12. Helpful. 14. Consists of; includes. 17. Sufficiently; well enough. 19. An odd event that is unlikely to happen again. 20. An unexpected happening that causes a computer breakdown. 21. Electronic devices that take the place of radio tubes. 22. Out-of-date; no longer useful or acceptable. 23. Requiring long, hard work. 24. Changing numbers; symbols that represent things that can change.

Down 1. Part. 4. A difficult problem. 5. Belonging to today. 6. Change. 7. Having to do with ideas that are being tested; not yet proven. 8. Tiny; extremely small. 10. Brings parts together into a whole. 13. A device that changes electricity to make it suitable for home use. 15. Full of doubt; suspicious. 16. Operated, controlled, or worked by a machine. 18. To form a picture of; imagine.