One thing that medicine's learned men once knew, or thought they knew, was that cancer is not infectious. Therefore, no "infectious agent" could be involved in its origin. Then a young (31) researcher just starting in at Manhattan's Rockefeller Institute for Medical Research, went to work on a sick Plymouth Rock hen. He took material from a tumor on the bird's breast, ground it ultrafine to smash the very cells, filtered the stuff through silica so that not even a broken cell could pass, and injected the liquid into healthy chickens. They soon developed cancers of the same type (sarcoma) as...
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