Medicine: Triumph of the Odd Couple

They share a Nobel Prize for pioneering the CAT scanner

They had never met, never corresponded. But on opposite sides of the Atlantic, U.S. Physicist Allan Cormack, 55, of Tufts University, and Research Engineer Godfrey Hounsfield, 60, of the British firm EMI Ltd., brooded over the same mathematical puzzle and independently reached the same solution. The puzzle: how to produce an X-ray image of tissue at any depth within a patient. The result: the CAT (for computerized axial tomography) scanner, a medical marvel now used in hospitals round the world. Last week the two scientists learned that they have something else in...