In his 2004 book Authentic Happiness, the University of Pennsylvania psychologist Martin Seligman tells the story of a lizard that won’t eat.
The lizard belonged to one of Seligman’s colleagues. No matter what it was offered — fruit, ground pork, dead flies — the lizard refused to eat. But then one day its owner tossed a newspaper down on top of a ham sandwich. The lizard pounced on the newspaper, shredded it to pieces, and devoured the sandwich beneath it.
“Lizards have evolved to stalk and pounce and shred before they eat,” Seligman writes in his book. “So essential was…
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