Consider, finally, anxiety. We are evolutionarily programmed, as we have seen, to be worriers: Our evolutionary ancestors who, instead of worrying about where their next meal was coming from and about the source of that growling noise in the trees, sat around blissfully enjoying the sunset probably didn’t live to a ripe old age. But most modern individuals—in developed countries, at any rate—live in a remarkably safe and predictable environment; there are no growling noises in the trees, and we can be reasonably certain that our next meal is forthcoming. There is simply much less for us to
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