How good is the Salk polio vaccine? So far, nobody knows the answer in detail, but there is enough evidence to show that the vaccine works on the great majority of subjects.
At the University of Michigan, 144 million facts yielded by last year's nation-wide tests have been recorded on IBM punch cards, but they are still so divided that no individual worker last week could see the answer. This had to wait until the boss evaluator, Dr. Thomas Francis Jr., gave the word to run all the cards through the machine. But the...
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