Drs. Mu-Ming Poo, Ai-Ke Guo and Shu-Min Duan were invited to attend the 25th Anniversary Conference on "Frontier in Bioscience: Learning and Memory" held in the City University of Hong Kong on June 16. During the conference, Drs. Mu-Ming Poo, Ai-Ke Guo and Shu-Min Duan gave invited talks entitled "Activity-induced modification of neural circuits - Hebb's postulate revisited", "Time to pick the flya€？s cognition" and "Contribution of glial cell in synaptic memory".