Fraternal or dizygotic twins develop from two different eggs fertilized by separate sperm; they generally share about 50 percent of their genes. Therefore, fraternal twins are essentially like ...

And the results of the study seem quite clear: the cognitive ability of a baby at seven months can quite accurately predict ...

Two sets of twins are top of their classes at Bethpage High School and Hicksville High School. Stacey Sager interviews them.

Hallmayer said twins both fraternal and identical have been studied by autism researchers as a way to try and figure out how much of the condition is genetic and how much is environmental.

Tamara Vanderent, 30, thought her daughters were fraternal twins for over a year, but she was stunned to discover that wasn't in fact the case.

These fraternal twins are both graduating as valedictorians of their high school this weekend and both headed to MIT in the fall!