On July 22, 2025, Yaoyao Zhang successfully defended her doctoral thesis entitled “Maximizing Cognitive Surplus for TVET: Motivation for User-Generated Content in Technical Instructional Videos.” We would like to express our sincere thanks to the other examiner, Prof. Dr. Ralf Tenberg from the Department of Technology Education at TU Darmstadt, as well as the chair, Prof. Dr. Alfred Riedl, and wish Yao all the best for the future.