Link: http://freakonomics.com/2014/05/15/the-three-hardest-words-in-the-english-language-a-new-freakonomics-radio-podcast/ Summary: What are the three most difficult words in the English language? According to Amanda Waterman, professor of Psychology at the University of Leeds, the words “I don’t know” are difficult for people, especially for children to fully express and admit. Original Air Date: May 15, 2014 Length: 30 min
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