Just before Katie Marsh dropped out of college, she began to worry that she might have attention deficit hyperactivity disorder. “Boredom was like a burning sensation inside of me,” said Ms. Marsh, who is now 30 and lives in Portland, Ore. “I barely went to class. And when I did, I felt like I had…
Twins are a bonanza for research psychologists. In a field perpetually seeking to tease out the effects of genetics, environment and life experience, they provide a natural controlled experiment as their paths diverge, subtly or dramatically, through adulthood. Take Dennis and Douglas. In high school, they were so alike that friends told them apart by…
