Most people today rarely step outside their comfort zones. We are living progressively sheltered, sterile, temperature-controlled, overfed, underchallenged, safety-netted lives. And it’s limiting the degree to which we experience our “one wild and precious life,” as poet Mary Oliver put it. But a radical new body of evidence shows that people are at their best—physically harder, mentally tougher, and spiritually sounder—after experiencing the same discomforts our early ancestors were exposed to every day. Scientists are finding that certain discomforts protect us from physical and
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