When you've chose a course of action and after some effort that course appears to be unproductive, sometimes you should persist in the present course, and sometimes you should change course

You should persist

"What doesn't kill me, makes me stronger"

According to John Ratey in his book Spark, there was a study (unpublished) that seems to show that small amounts of radiation (above the normal background level) are actually beneficial. This is part of his larger point that stress can be good, that there is a sweet spot between too little and too much stress.

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