on a ?eld that is in many important ways complementary to myownresearch. Iwasimpressedbytheinterdisciplinarywaysinwhichsingle molecule spectroscopy has evolved and is currently pursued, with ingredients originating from physics, all branches of chemistry and a wide range of b- logical and biomedical research. A beautiful concert by Semmy Stahlhammer and Johan Ull¿ en further extended the interdisciplinary character of the s- posium. I would like to combine thanks to Rudolf, Jerker and Astrid with a glance into a future of other opportunities to enjoy top-levelscience combined with warm hospitality in the Swedish tradition. Z¿ urich, Kurt Wuth ¿ rich April 2009 Participants of the Nobel-Symposium 138: First row: Sarah Unterko?er, Anders Liljas, Xiao- Dong Su, Birgitta Rigler, Carlos Bus- mante, Toshio Yanagida, Steven Block, Xiaowei Zhuang, Sunney Xie. Second row: Ivan Scheblykin, Lars Thelander, Petra Schwille, Watt W.