Medicine: Early Warning System

Of all the common forms of malignancy, breast cancer is one of the most frightening. It is now killing 32,000 American women a year, and by the time a woman or her doctor is able to notice a lump under the skin, the disease has often spread to other parts of the body. Thermography, which measures the heat radiated by tumorous tissue, and conventional X rays can help in early detection. Now a new refinement of an old technique promises to allow the spotting and treatment of breast cancer when it is no larger...

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