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  4. Arthur Compton
  5. Twenty thousand years ago the family was the social unit....

Twenty thousand years ago the family was the social unit. Now the social unit has become the world, in which it may truthfully be said that each person's welfare affects that of every other.

Arthur Compton
Family, Years, Twenties
Twenty thousand years ago the family was the social unit. Now the social unit has become the world, in which it may truthfully be said that each person's welfare affects that of every other.