Binary populations and stellar dynamics in young clusters
  We first summarize work that has been done on the effects of binaries on theoretical population synthesis of stars and stellar phenomena. Next, we highlight the influence of stellar dynamics in young clusters by discussing a few candidate UFOs (unconventionally formed objects) like intermediate mass black holes, Eta Carinae, Zeta Puppis, Gamma Velorum and WR 140. 
D. Vanbeveren, H. Belkus, J. Van Bever, N. Mennekens