1.   Identical twins, clearly, are far more concordant in general than are fraternal twins.

2.   Noelle and Craig are fraternal twins.

3.   Among those players were the Manojilovic sisters, fraternal twins who wanted to become better basketball players in the United States.

4.   As former USC coach John Robinson learned, recruiting accolades and pressure to win are fraternal twins.

5.   As fraternal twins, the Shapiro brothers grew up sharing the same room and the same schoolteachers, but not the same interests.

6.   Because the rate of identical twinning is nearly identical worldwide, differences in twinning rates, overall, are determined almost entirely by varying rates of fraternal twin births.

7.   After interviewing the stutterers and their twins, the researchers found that both identical twins were more than three times as likely as fraternal twins to be stutterers.

8.   But fraternal twins, according to years of psychological studies, are typically no closer than other siblings.

9.   But if being an identical twin is a stronger risk factor for autism than being a fraternal twin, the twin studies have probably overestimated the influence of genes.

10.   David Koch, right, has sided with brother Charles against William, his fraternal twin.