Rats in labs eventually work out which behaviour stops the electric shocks, but I had to be taught by a podcast. Comedian Hannah Berner was a recent guest on Armchair Expert, and revealed she hardly ever looks in the mirror.

“It has information you don’t need about you,” she explained.

Host Dax Shepard immediately leapt on board with the revelatory theory: “I’d say over the course of my life, the amount of times I looked in the mirror and was pumped is certainly under 1%. I’ve never looked and been........

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