Identical twins reared apart turn out to weigh almost exactly the same.

How alike, after all, are these identical twins reared apart?

Chimps reared apart will have to be carefully introduced to one another, a process that could take months.

In addition, he said, "identical twins reared apart are just not a random sample of the population."

That investigation focuses on identical twins who were reared apart and therefore share relatively little common experience.

"Sources of human psychological differences: the Minnesota study of twins reared apart."

The book also includes research on twins reared apart and information on several other switched at birth twin cases.

Even when environmental factors were controlled by studying identical twins reared apart, the concordance rate remained the same.

A limit of this design is the common prenatal environment and the relatively low numbers of twins reared apart.

The biggest surprise to come from the Bernard research is that twins reared apart aren't any more different than those reared together.