Lynn Koplitz is a prominent standup comedian who may be seen performing regularly at the Comedy Cellar. Her new standup special, "Hormonal Beast," is available on Netflix.

Jessica Kirson is a prominent standup comedian who may be seen performing regularly at the Comedy Cellar. She may also be heard regularly on "The Howard Stern Show."

Dr. Nancy Segal is a Professor of Psychology at California State University, Fullerton, and is the director of the Twin Studies center. She is the author of the new book "Twin Mythconceptions: False Beliefs, Fables, and Facts About Twins."