"Probably the most useful tool for research since the discovery of the microscope" was described in detail last week by Dr. Joseph G. Hamilton of the University of California. The tool he referred to is the use of radioactive elements, and his comparison was apt. Whereas the microscope makes visible aspects of living tissue which cannot be seen with the naked eye, the use of radioactive elements as tracers makes it possible to learn what becomes of elements taken into a living organism as food, to study the intricate mechanics of metabolism in living...
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