Falling in Love

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Across
  1. 3. a chemical that sends messages in the brain
  2. 4. part of the brain that helps with processing emotions
  3. 8. a substance that makes pain go away
  4. 10. someone know in passing but not well
  5. 12. expression when the body activates a gene so it manifests physically in one's body
  6. 13. being in love with something intensely, but usually for a short time
  7. 15. staying with only one person for a long period of time
  8. 16. something that makes an important or notable difference
  9. 18. the point at which something can be detected
  10. 19. the first time something happens
Down
  1. 1. when events happen fast
  2. 2. chemical messengers throughout the body
  3. 5. something is unable to be harmed
  4. 6. to say something confidently
  5. 7. something that is perfectly made to do something specific.
  6. 9. to go to a high level
  7. 11. to make higher or stronger
  8. 14. a mixture of many ingredients, often a drink
  9. 17. a small mouse like animal that lives in the ground