school of hard knocks |1912 - coined by George Ade, a popular Midwestern columnist and author, in his book "Knocking the Neighbors" | education by difficult, painful experiences
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|popularized by [[Milton Friedman]] in his book, ''Free to Choose''
|popularized by [[Milton Friedman]] in his book, ''Free to Choose''
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|school of hard knocks
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|1912<ref>coined by George Ade, a popular Midwestern columnist and author, in his book "Knocking the Neighbors": [https://archive.org/stream/knockingofneigh00abegrich/knockingofneigh00abegrich_djvu.txt]</ref>