An asthma inhaler equipped with Global Positioning System (GPS) capability could allow researchers to track when and where asthma attacks occur-and reveal previously unknown environmental triggers and "hot spots." David Van Sickle, a medical anthropologist and epidemiologist who's currently a Robert Wood Johnson Foundation Health and Society Scholar at the University of Wisconsin-Madison, worked with the university's biomedical engineering department to develop a prototype that receives and transmits GPS signals even as it delivers medication. A pilot study, designed to evaluate the device's accuracy and reliability and funded by the Centers for Disease Control and Prevention, is ongoing.