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Both the attempt to characterize and understand the olfactory behavior of living organisms ( 1– 6) and the more recent effort to design and build “sniffing machines”-robots that navigate by using odors as a guide ( 7– 9)-face the common problem of understanding how the information gained from sporadic detection of odor dispersed in a naturally turbulent flow can be efficiently used for locating the source. Olfactory search strategies are interesting because of their relevance to animal behavior ( 1– 6) and because of their potential utility in practical applications such as searching for chemical leaks, drugs, and explosives ( 7).