On November 13, 2009, the Institute of Photonic Technology (IPHT) will be one of the hosts during the “Long Night of Sciences” in Jena. The Institute will open its doors to the public with 12 exhibits and 6 laboratory tours. From 6 p.m. to midnight visitors with a thirst for knowledge will have the opportunity to look over the scientists’ shoulders, ask questions, and register their names in the world’s smallest guestbook.