Why do people collect?

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Across
  1. 1. the signature of a famous person
  2. 4. in a way that shows love
  3. 7. a natural quality
  4. 8. very old
Down
  1. 2. to make something less or smaller in size
  2. 3. a scientist who studies the mind and how it influences the way we act
  3. 5. your thoughts or feelings about somebody or something
  4. 6. feeling worried or nervous