if ten things happen to you during a day at work or in a relationship, and nine of them are positive while one is negative, what do you tend to think about most? Probably the negative one. Pleasant, useful, beneficial experiences happen many times a day—enjoying a cup of coffee, getting something done at home or work, snuggling into bed with a good book at night—but they ordinarily pass through the brain like water through a sieve, while each stressful or harmful experience gets stuck to it. We’re designed to over-learn from bad experiences while under-learning from good ones.
