To raise twins is a challenge, just as it is to be part of a twin pair. This was the message communicated by Joan Friedman, the author of the book: Emotionally Healthy Twins: A New Philosophy for Parenting Two Unique Individuals. Friedman is a twin herself and also a mother of twins, and a psychotherapist specialized in the treatment of twin-related problems. The book presents seven basic concepts meant to raise twins in such a way that they become emotionally healthy adults.

As young people grow up, most will battle with their own sense of identity, but for twins this struggle can be more painful and prolonged. Some need to prise themselves from a ‘twosome package-deal’ identity, while others need to cast aside an identity based solely on differences from their co-twin: labelled by the well-meaning in an attempt to find uniqueness ‘Linda is the creative one; Laura the scholar’. The path to emotional happiness is difficult to navigate. What can parents do to make the journey less painful? Joan Friedman's Emotionally healthy twins provides some useful pointers outlined in a new philosophy of twin parenting.

Economics arranges its topics as Big, Medium, and Small. Mr Big is the Industrial Revolution: How did it happen, and when? Whence did it spread, and at what rate? What were the costs and benefits? The literature is vast and the answers are numerous. But it organizes around a fundamental phenomenon: from about 1800, economic growth began an upward climb that in fifty years captured the world's purse and that in another half century had increased the wealth of industrial nations many times. Intoxication with this achievement is expressed in museums of science and industry and on websites featuring the Paris Exhibition of 1889 and the Chicago Exhibition of 1893.

The purpose of Behavioral Genetics 5th edition (BG) is to cover the knowns and unknowns of behavior genetics, conveying the excitement of the field, its prospects, and something of the methods. Like the important American Psychologist (AP) paper ‘Intelligence: Knowns and Unknowns’ (Neisser et al., 1996), BG is designed to convey a consensus, in this case across fields as diverse as autism and xenophobia. Establishing and communicating this consensus is especially important for behavior genetics when many students are relatively unaware of the existence of biological differences. To meet this bold purpose the book needs to be accessible to those new to genetics while remaining accurate, and this goal is met admirably. The text is suffused with a calm and even handed approach that allows it to address its pedagogical task far better than most texts. It has been honed across the decades, including a complete rewrite (3rd edition), and, now, two rounds of fine-tuning. This polish pays off: the book reads very well, is well indexed, and integrated.