One problem is that separated identical twins do not actually provide a perfect nature-versus-nurture template.
ECONOMIST: WHAT WE LEARN FROM TWINS: The mirror of your soul | The
In the nature-versus-nurture debate, psychologists say fathers play an important role in the men their sons become.
CNN: STORY HIGHLIGHTS
As soon as he knew a visitor's political view, said Fisher, he also could predict where he would stand on the nature-versus-nurture issue in genetics.
ECONOMIST: Famous economists
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