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"Curiosity killed the cat" goes the proverb. 

After doing a bit of a search on the Internet, you will find a version that says it
 originated as 'care killed the cat', meaning 'worry'.

My version is that what killed the cat was not curiosity but wondering what was on the other side of the fence and worrying about it, instead of just jumping the fence. 

Education is about learning by Ken Robinson

Growth Mindset by Cameron Lisney