Throughout human history, twins have been rare, which often makes them seem extraordinary. Across various cultures, twins are symbols of strength and health, while in others, they represent ...

Though rare, twins can be born with different skin ... These twins, called biracial twins, are a great example of how unique ...

Michael and Hannah Carmack welcomed the "incredibly rare" set of quadruplets at the UAB Women and Infants Center in Birmingham on March 14, according to Today. The pair of identical twins ...