About 3 out of every 100 births in the United States yields twins. Studying twins is a way for scientists to determine how much of our characteristics are influenced by genetics, since identical twins share nearly 100 percent of their DNA, whereas fraternal twins or normal siblings only share about 50 percent. This list is full of the most interesting twin study findings, and you might be surprised by how significant a role genetics play in determining your future.These interesting twin studies also give us insight into how human beings interact with one another. Vote for what you think is the coolest twin study discovery.
Social Behavior Starts in the Womb
Gender Identity Is Genetically Determined
Twin boys Bruce and Brian Reimer didn't consent to participating in a case study on gender. Their parents volunteered them, after an accident during what should have been a simple circumcision left Bruce with significant injuries to his genitals. Dr. John Money, who believed that gender was entirely determined by upbringing, suggested that Bruce's parents raise him as a girl.The parents took the doctor's advice, and Bruce became Brenda. The experiment seemed to go just as Dr. Money planned, until Brenda became a teenager. She became depressed and then suicidal. To save her, her parents told her that she had been born a boy, and from that point on, she decided to live life as a man.