The simple riddle that 50% of Harvard students get wrong

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Sources
Cognitive reflection test
http://emilkirkegaard.dk/en/wp-content/uploads/Shane-Frederick-Cognitive-Re%EF%AC%82ection-and-Decision-Making.pdf

Cognitive reflection test and cognitive biases
http://www.keithstanovich.com/Site/Research_on_Reasoning_files/MC_2011.pdf

Font in cognitive reflection test
http://pages.stern.nyu.edu/~aalter/intuitive.pdf

Fonts in school
https://web.princeton.edu/sites/opplab/papers/Diemand-Yauman_Oppenheimer_2010.pdf

Fonts and cognitive strain
http://rady.ucsd.edu/faculty/seminars/2010/papers/oppenheimer.pdf

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