Yet with all our knowledge of the outside world ninety-nine lives out of every hundred are comparative failures. The reason is plain to every scientific investigator. We have failed to study ourselves in relation to the great environmental problem of today. The stage-setting has been changed but not the play. The game is the same old game--you must adjust and adapt yourself to your environment or it will destroy you. Mastering His Own Environment The cities of today _look_ different from the jungles of our ancestors and we imagine that because the brain of man overcame the old menaces no new ones have arisen to take their place. We no longer fear extermination from cold. We turn on the heat. We are not afraid of the vast oceans which held our primitive forebears in thrall, but pass
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