Vandenbroucke_deco_app

A screen capture of a pocket cosmic-ray detector app, called DECO, is pictured on Sept. 2, 2014. The app, which uses the image sensor of a cell phone camera to detect cosmic rays and other energetic subatomic particles, was created by Justin Vandenbroucke, assistant professor of physics at the University of Wisconsin-Madison. (Photo courtesy of Justin Vandenbroucke)