Nearly 200 guests attended the Winter Parents & Science Program—The First Big Love: Exploring the Neurobiology of Parent-Child Bonding—held at The Rockefeller University on February 10, 2011.  Thomas Insel, M.D., who is the Director of the National Institute of Mental Health, opened the program by discussing the critical roles of the brain chemicals oxytocin and vasopressin in social attachment.  Later in the program, Myron Hofer, M.D., Director of Columbia University Medical Center's Sackler Institute for Developmental Psychobiology, further explored the study of the infant mother relationship and its longterm impact.  A lively Q&A session with the audience followed.