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Computer

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Across
  1. 1. phones emits blue light
  2. 6. a type of light
  3. 7. what we our bodies need to rest
  4. 9. something that our bodies produce
  5. 10. comes from the sun or bulbs
  6. 11. an idea
  7. 12. causes cancer
  8. 13. when there is no light
  9. 15. a person who studies about things
  10. 16. when we are not asleep
  11. 17. a sickness
  12. 18. widespread sickness
  13. 19. when you type on your phone
  14. 20. screen emits blue light
Down
  1. 2. what helps to sleep
  2. 3. light keeps us awake
  3. 4. how much light something has
  4. 5. something that shines
  5. 8. book does not emit blue light
  6. 12. system our biological clock
  7. 14. when something effects you
  8. 17. a sickness people get
  9. 21. when you are on the internet