Simple math challenges for middle schoolers are among the most viral content on the web. An image showing a calculation written in the palm of a hand is currently all the rage on Facebook. The promise is provocative: “Finish this if you’re a genius. 2 – 2 × 3 + 3. 95% failure rate . “
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Upon reading this ultra-short text, the immediate reaction of most internet users is to respond within seconds. Yet, the comment sections are torn apart by completely different responses: 3 , -7 , 1 , or even -1 . Why does such a simple equation provoke so much disagreement?
