New discoveries about the human mind show the limitations of reason.![](https://media.newyorker.com/photos/59097e2f8b51cf59fc42419f/16:9/w_1200,h_630,c_limit/170227_r29468.jpg)
The vaunted human capacity for reason may have more to do with winning arguments than with thinking straight.
Illustration by Gérard DuBois
In 1975, researchers at Stanford invited a group of undergraduates to take part in a study about suicide. They were presented with pairs of suicide notes. In each pair, one note had been composed by a random individual, the other by a person who had subsequently taken his own life. The students were then asked to distinguish between the genuine notes and the fake ones.
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