For years, the phenomenon has been dismissed as a joke, but father Sam Fishwick was delighted to discover it’s real. He talks to psychologist Darby Saxbe about the science of how fatherhood rewires men’s brains and the comforting findings behind her new book I don’t want to get too schmaltzy, I tell Darby Saxbe, but I really did like your book . In fact, Dad Brain : The New Science of Fatherhood and How It Shapes Men’s Lives is probably the most I have related to anything I have watched,