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Early one May morning in 1927 researcher Wilhelm Schmidt attached a mercury thermometer to his car door and drove around Vienna for three hours, recording temperatures. His resulting thermal maps showed hotter areas that coincided with "tightly built parts of the inner city" and cooler contours tracing wooded patches, grassy parks and waterways. Schmidt's efforts were the first to map a city's "islands" of heat in a "sea" of lower-temperature surroundings. University of Toulouse meteorology researcher Eva Marques and her colleagues are now updating Schmidt's car technique with modern methodology to chart dangerous heat zones. Their approach uses thermometers in Internet-connected personal cars to map how temperatures can vary over just a few city blocks; such data could help urban planners develop heat-mitigation policies in places without access to sophisticated instrumentation.