Malcolm Gladwell [ 14 FEB 2013 | Mindset ] I was recently asked to give a public lecture at the University of Pennsylvania on the subject of “proof.” My question is: How much proof do we need about the harmfulness of something before we act? I began with the strange history of how long it took for society to grasp the seriousness of black-lung disease, and then moved into an argument about the black-lung diseases of today.

Proof Pudding
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