Whether in family life, social interactions, or business negotiations, half the people in the world speak more than one language every day. Yet many myths persist about bilingualism and bilinguals. In a lively and entertaining book, an international authority on bilingualism explores the many facets of life with two or more languages.

The identical “Jim twins” were raised in separate families and met for the first time at age thirty-nine, only to discover that they both suffered tension headaches, bit their fingernails, smoked Salems, enjoyed woodworking, and vacationed on the same Florida beach. This example of the potential power of genetics captured widespread media attention in 1979 and inspired the Minnesota Study of Twins Reared Apart. This landmark investigation into the nature-nurture debate shook the scientific community by demonstrating, across a number of traits, that twins reared separately are as alike as those raised together.

As a postdoctoral fellow and then as assistant director of the Minnesota Study, Nancy L. Segal provides an eagerly anticipated overview of its scientific contributions and their effect on public consciousness. The study’s evidence of genetic influence on individual differences in traits such as personality (50%) and intelligence (70%) overturned conventional ideas about parenting and teaching. Treating children differently and nurturing their inherent talents suddenly seemed to be a fairer approach than treating them all the same. Findings of genetic influence on physiological characteristics such as cardiac and immunologic function have led to more targeted approaches to disease prevention and treatment. And indications of a stronger genetic influence on male than female homosexuality have furthered debate regarding sexual orientation.

A Marginal Revolution Book of the Year

After tracking the lives of thousands of people from birth to midlife, four of the world’s preeminent psychologists reveal what they have learned about how humans develop.

Does temperament in childhood predict adult personality? What role do parents play in shaping how a child matures? Is day care bad—or good—for children? Does adolescent delinquency forecast a life of crime? Do genes influence success in life? Is health in adulthood shaped by childhood experiences? In search of answers to these and similar questions, four leading psychologists have spent their careers studying thousands of people, observing them as they’ve grown up and grown older. The result is unprecedented insight into what makes each of us who we are.

In The Origins of You, Jay Belsky, Avshalom Caspi, Terrie Moffitt, and Richie Poulton share what they have learned about childhood, adolescence, and adulthood, about genes and parenting, and about vulnerability, resilience, and success. The evidence shows that human development is not subject to ironclad laws but instead is a matter of possibilities and probabilities—multiple forces that together determine the direction a life will take. A child’s early years do predict who they will become later in life, but they do so imperfectly. For example, genes and troubled families both play a role in violent male behavior, and, though health and heredity sometimes go hand in hand, childhood adversity and severe bullying in adolescence can affect even physical well-being in midlife.

Painstaking and revelatory, the discoveries in The Origins of You promise to help schools, parents, and all people foster well-being and ameliorate or prevent developmental problems.

A Marginal Revolution Book of the Year

“Brings the groundbreaking research of the top developmental psychologists of the past quarter-century to a wider audience…A masterpiece!”—Dante Cicchetti, Institute for Child Development at the University of Minnesota

“Deliver[s] a flood of insights around the book’s central question: To what degree do our childhood personalities and behaviors predict our adult selves?”—Wall Street Journal

“One of the best and most important works of the last few years…Fascinating.”—Tyler Cowen, Marginal Revolution

Does childhood temperament predict adult personality? What role do parents play in shaping how a child matures? Is day care bad—or good—for children? Does adolescent delinquency forecast a life of crime? Do genes influence success in life? Is one’s health shaped by childhood experiences? In search of answers to these questions, four leading psychologists dedicated their careers to studying thousands of people, observing them as they grew and emerging with unprecedented insight into what makes us who we are.

They found that human development is not subject to ironclad laws so much as a matter of possibilities and probabilities—multiple forces that together determine the direction of one’s life. The early years do predict who we become, but they do so imperfectly. At once actionable and revelatory, The Origins of You is an invaluable guide for parents, teachers, and anyone working with or caring for children.

The twenty-first century has seen dramatic shifts in the nature of work, including a decrease in economic security and job opportunities for low-skilled workers. At the same time, the nature of families has also changed significantly, including a delay and decrease in marriage and the development of new types of complex family structures. These changes in work and family have contributed to a rise in inequality, with many lower-income families experiencing poverty and economic hardship as a result. Yet, public policy has not adapted to address these issues. In this issue of RSF, sociologists Marcia J. Carlson, and Christopher Wimer, developmental psychologist Ron Haskins, and an interdisciplinary group of contributors examine the growing needs of low-income families and explore both the extent to which public policy effectively serves them and how it can be improved.
 
The nine articles in this issue examine various aspects of contemporary work and family life for low-income families, the challenges they face, and whether current policies help to mitigate these challenges. Sigird Luhr and colleagues find that unpredictable work schedules were associated with increased difficulty arranging childcare, work-life conflict, and missed work for working mothers. Elizabeth O. Ananat and colleagues show that Emeryville, California's Fair Workweek Ordinance decreased working parents' schedule unpredictability, and improved their well-being without reducing worker hours. Pamela Joshi and colleagues find that less than a quarter of low-income, full-time working families earn enough to cover a basic family budget, compared to two-thirds of all full-time working families. Katherine M. Michelmore and Natasha V. Pilkauskas reveal that nearly 60% of children in lower-income families reside in households with a complex family structure that may result in difficulty filing for important tax credits like the Earned Income Tax Credit (EITC) that can help increase their incomes. Jennifer Randles shows that income and public aid are insufficient for many mothers to cover the cost of one of children’s basic needs - diapers - and suggests policies to help bridge this gap in the face of widespread economic insecurity.
 
This volume of RSF illuminates the many obstacles faced by lower-income families due to changes in the labor market and family patterns as well as the ways in which public policy can better respond to alleviate these obstacles.
 
 

Wealth – a household’s assets minus its debts – is an important indicator of child well-being. Higher household wealth related to better academic achievement, behavior, and health among children. Yet a sizeable share of American children, including a majority of Black and Hispanic children, grow up in households with very low levels of wealth, and wealth inequality among households with children is rising even faster than among the general population. This volume of RSF, edited by social policy experts Christina Gibson-Davis and Heather Hill, provides the first comprehensive examination of the contours and consequences of wealth inequality for children under the age of 18. An interdisciplinary roster of contributors consider the vast racial and ethnic disparities in wealth and how those disparities affect child well-being. 
 
Contributors Fabian Pfeffer and Nora Waitkus find that child wealth inequality is far worse in the U.S. than in other industrialized countries. Editors Gibson-Davis and Hill show that a relatively small group of American parents—mostly White—control the lion’s share of wealth, with Black and Hispanic parents having only pennies on the dollar for every dollar of White parental wealth. Nina Bandelj and Angelina Grigoryeva show how White parents with above median wealth are more likely than other parents to practice “financially intensive parenting,” saving and borrowing in ways that promote child achievement. After controlling for other measures of family resources and socioeconomic status, Portia Miller and colleagues demonstrate that family wealth is uniquely related to both academic and behavioral development throughout childhood and adolescence and that wealth helps buffer the negative effects of low family income. Jordan Conwell and Leafia Zi Ye find equalizing wealth is not sufficient to eliminate race- and ethnic-based gaps in academic achievement: even among families with the same levels of wealth Black and Hispanic children often have significantly worse scores than Whites.   
 
High levels of childhood wealth inequality are not inevitable; they are the consequence of laws and practices that favor wealth accumulation among few, primarily White, families. Jin Huang and coauthors look at one of the few policy models for increasing savings in low-income child households, Child Development Accounts, which have been shown to increase educational savings and improve maternal mental health, but they have yet to be adopted nationwide. Two studies in this issue, by Margot Jackson and colleagues and by Katherine Michelmore and Leonard Lopoo, find that large-scale income-support programs, the EITC and Medicaid, have positive spillovers onto asset accumulation, but policies designed to fundamentally alter the distribution of wealth among families with children will require more expansive changes to the tax code and program asset caps.
 
This issue of RSF expands our understanding of wealth inequality and its effects on children, and provides important insights into policies and practices that either directly or indirectly boost wealth acquisition among child households.
 

 

Is love “blind” when it comes to gender? For women, it just might be. This unsettling and original book offers a radical new understanding of the context-dependent nature of female sexuality. Lisa M. Diamond argues that for some women, love and desire are not rigidly heterosexual or homosexual but fluid, changing as women move through the stages of life, various social groups, and, most important, different love relationships.This perspective clashes with traditional views of sexual orientation as a stable and fixed trait. But that view is based on research conducted almost entirely on men. Diamond is the first to study a large group of women over time. She has tracked one hundred women for more than ten years as they have emerged from adolescence into adulthood. She summarizes their experiences and reviews research ranging from the psychology of love to the biology of sex differences. Sexual Fluidity offers moving first-person accounts of women falling in and out of love with men or women at different times in their lives. For some, gender becomes irrelevant: “I fall in love with the person, not the gender,” say some respondents.Sexual Fluidity offers a new understanding of women’s sexuality—and of the central importance of love.