The link between the Brexit debate and flush lavatories

On a scale of one to seven, how well do you understand how a flush lavatory works?

This was a question asked by Yale psychologists Leonid Rozenblit and Frank Keil, almost two decades ago. Before I explain why, here's a follow-up exercise: Write down your lavatory explanation in as much detail as you can. You may wish to draw a diagram, or explain it to a friend. Or not.

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A version of this article appeared in the print edition of The Straits Times on June 22, 2019, with the headline 'The link between the Brexit debate and flush lavatories'. Print Edition | Subscribe