Twins have been rare in human history and for that reason can seem special. Many cultures associate twins with health and vitality, while others see them as a philosophical reminder of the duality of ...

Fascination with twins and what twin studies tell us about human nature is universal. There is no question that behavioral and medical science advances have happened largely because twins yield a ...

A new long-term study of human twins by University of Colorado Boulder researchers indicates the makeup of the population of bacteria bathing in their saliva is driven more by environmental factors ...

Brittany and Briana Deane Salyers are married to brothers Josh and Jeremy, and both couples have young sons who are considered "quaternary twins" Jason Hahn is a former Human Interest and Sports ...