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The gaining of strength through adversity and its inverse of atrophy can be found in countless places throughout nature, biology, and human history. There's nothing mythical about that.

Take a cat that has lived an easy life indoors its whole life and put it outside.

How long do you think that cat will survive outdoors compared to a cat who has lived outside its whole life?

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It’s not about being pampered or shielded from the world. There is a difference between a) being challenged, being put into competitive environments, and having access to a wide range of experiences and b) having negative childhood events or trauma.

You are moving the goalpost. The whole comment thread is about how humans that had a harder upbringing could be more resilient to mental breakdown for long-term interplanetary colonization. A cat would not be a relevant organism to study to answer this question.

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