Diagnosis: The Trouble with Hot Spots

For all the painstaking care he puts into the pictures he takes, Dr. Jacob Gershon-Cohen could be one of the arti est of arty photographers. In his darkened studio, the temperature has to be just right-a steady 68° to 72°. He insists that subjects stretch out and relax for 15 minutes before the first picture is snapped. But Dr. Gershon-Cohen, a radiologist at Albert Einstein Medical Center in Philadelphia, is the extremely careful scientist, not the temperamental artist. Borrowing a technique space researchers use to take temperature readings of Venus, he photographs...

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