Riccardo Ferdani (left), staff scientist in radiology, assists fourth-graders Kamryn Senizaiz (center) and Hannah Fuller in applying ketchup and coffee to stain-resistant fabric treated with nanoparticles. Carolyn Anderson, Ph.D., professor of radiology and of biochemistry and molecular biophysics, invited the students and their classmates from Flynn Park Elementary in the University City School District on campus to learn about nanotechnology through her work with the Program of Excellence in Nanotechnology (PEN) grant. Assisting Anderson were Monica Shokeen, instructor in radiology; Chris Sherman, senior research technician in radiology; and Mary C. Mohr, coordinator for Science Outreach. PEN is a collaboration between the Department of Chemistry in Arts & Sciences, the School of Medicine and the University of California campuses in Berkeley and Santa Barbara. It is supported by a $12.5 million grant from the National Institutes of Health.