To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S1. A peroxide-based explosive mimic is detected inside a cardboard box with a GPS-enabled SGS4. Wireless gas detection with a smartphone via rf communication Joseph M. Azzarelli, Katherine A. Mirica, Jens B. Ravnsbæk, and Timothy M. Swager PNAS. 2014. 111:18162-18166 DOI: 10.1073/pnas.1415403111 Download Original Video Browse All Videos »