does it pay to be kind to strangers

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Across
  1. 3. This builds in a society when people are consistently kind
  2. 6. A feeling of belonging or link with another person
  3. 9. The effect when one kind act leads to many more
  4. 11. Building useful relationships by being helpful to others
  5. 12. The practice of exchanging things for mutual benefit
  6. 13. A simple and free way to show kindness to a stranger
  7. 15. The quality of being thankful or showing appreciation
Down
  1. 1. A person whom one does not know or has not met
  2. 2. The quality of being human; the collective spirit of kindness
  3. 4. Sympathetic concern for the misfortunes of others
  4. 5. The mental state of well-being that increases when we help others
  5. 7. The hormone released during social bonding or kindness
  6. 8. The practice of selfless concern for the well-being of others
  7. 10. The quality of being kind and giving
  8. 14. Understanding and sharing the feelings of a stranger