Chapters in this book

1. Frontmatter i
2. Contents v
3. Introduction 1
4. CHAPTER ONE. The Jim Twins (February– March 1979) 17
5. CHAPTER TWO. 15,000 Questions × 137 Pairs 32
6. CHAPTER THREE. Early Findings (1979– 1983) 65
7. CHAPTER FOUR. Sexual Orientation, Cognition, and Medical Traits (1984– 1987) 82
8. CHAPTER FIVE. Pivotal Papers: Personality and IQ (1988 and 1990) 97
9. CHAPTER SIX. Job Satisfaction, Cardiac Characteristics, and More (1989– 1990) 116
10. CHAPTER SEVEN. Psychopathology and Religiosity (1990) 136
11. CHAPTER EIGHT. Dental Traits, Allergies, and Vocational Interests (1991– 1992) 153
12. CHAPTER NINE. Creativity, Work Values, and Evolution (1992– 1993) 171
13. CHAPTER TEN. Family Environments, Happiness, Sensation Seeking, and the MMPI (1994– 1997) 195
14. CHAPTER ELEVEN. “Larks” and “Owls,” Ego Development, and Authoritarianism (1998– 2002) 221
15. CHAPTER TWELVE. Twin Relationships, Social Attitudes, and Mental Abilities (2003– 2005) 246
16. CHAPTER THIRTEEN. Sexual Development, Fluctuating Asymmetry, Body Size, and the Structure of Intelligence (2006 and Beyond) 266
17. CHAPTER FOURTEEN. Questions, Answers, and Twin Studies of the Future 298
18. APPENDIX A. Funding Sources 329
19. APPENDIX B. Glossary 333
20. Notes 339
21. Acknowledgments 397
22. Index 401