21.   If identical twins are more alike in some trait than fraternal twins, then the trait is thought to have a high heritability.

22.   Identical twins are more likely to have similar eyesight than fraternal twins.

23.   Kerry Kennedy Cuomo gave birth Wednesday evening at Georgetown University Hospital in Washington to fraternal twin daughters.

24.   Now scientists in Finland have some clues about fraternal twins.

25.   Successful kidney transplants between fraternal twins and between unrelated donors and recipients followed quickly over the next decade.

26.   The correlation is far from perfect, though, and not all that much greater than for fraternal twins, which suggests that environmental factors also matter.

27.   The distinctive coupe shares a family resemblance, but it looks more like a cousin than a fraternal twin.

28.   The fraternal twins died from single gunshot wounds, said Detective Ron Phillips.

29.   The pendulum is swinging back to the middle, said Nancy Segal, a fraternal twin who is writing a book on twins.

30.   The result is a show about the misadventures of fraternal twins, a boy and a girl, and their best friends, also a boy and girl.