In analyzing what made the Golden Century of 1870 to 1970 possible, it becomes clear that four physical infrastructure technologies provided the underlying foundation for growth: energy, transportation, health and sanitation, and communication.

Disease and ill health are caused largely by damage at the molecular and cellular level, yet today's surgical tools are too large to deal with that kind of problem.

Rest when you're weary. Refresh and renew yourself, your body, your mind, your spirit. Then get back to work.

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