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  1. Friendships: Enrich your life and improve your health

  2. Friendship - Wikipedia

  3. Friendship | Definition, Changes During Life, & Gender Differences ...

  4. 6 Benefits of Friends: Why It's Important to Stay Close - Verywell …

  5. The Importance of Friendship - Psychology Today

  6. What Is Friendship? - HowStuffWorks

  7. The 4 Levels of Friendship (According to Science) - SocialSelf

  8. Ideas about Friendship - TED

  9. The science of friendship - American Psychological Association

  10. Friendology: The Science of Friendship - Psychology Today