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Kathy Wendolkowski used to make candy in her spare time.

The ability to efficiently and unobtrusively screen for trace amounts of explosives on airline passengers could improve travel safety – without invoking the ire of inconvenienced fliers. Toward that end, mechanical engineer and fluid dynamicist Matthew Staymates of the National Institute of Standards and Technology in Gaithersburg, Maryland, and colleagues have developed a prototype air sampling system that can quickly blow particles off the surfaces of shoes and suck them away for analysis.