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Across 2. practicality, dealing with problems in a practical way 4. to soak; wet thoroughly 6. a coworker, especially in a particular business or profession 9. to get someone very interested 11. great eagerness or zeal 12. absolutely essential or necessary 13. prickly; having spines 14. Something that puzzles, perplexes, or confuses; enigma 15. a clear, deep and sometimes sudden understanding of a complicated problem or situation

Down 1. to put to some practical or specific use 3. something newly introduced or invented 5. a thought or writing about something, particular in the past, or what one sees when looking into a mirror or body of water 7. the study of the structure and function of biological systems as models for the design and engineering of materials and machines 8. an object or a tool that has been invented for a particular purpose 10. something that is practical or has many uses