The frontiers of knowledge in the various fields of our subject are expanding at such a rate that work as hard as one can one finds oneself further and further away from an understanding of the whole.
One could not have isolated this retrovirus without knowledge of other retroviruses that's obvious. But I believe we have answered the criteria of isolation.
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A knowledge of the forces that rule society of the causes that have produced its upheavals and of society's resources for promoting healthy progress has become of vital concern to our civilization.
