Some have even called for an end to twin-studies related to crime.

Cap: As usual, liberals are afraid of the truth.

Advanced techniques for improving our species.

Study of 12,500 twins finds academic performance is between 54 and 65 percent heritable.

Criminal behavior has a heritability of 39 to 56 percent in men.

Researchers critique one criticism of twins studies.

Study confirms genes account for “most of the differences” in learning ability.

So is adult aggression.

Skeptics of previous studies were probably genetically-predisposed to emphasize environment.

The New York Times discovers twin studies.