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 ...

It makes sense that identical twins would have the exact same DNA, right? Spoiler alert: Not always! Here's why. Identical twins (also called monozygotic or MZ twins) are conceived when a single sperm ...

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 ...

Ever heard of "heteropaternal superfecundation"? It's an extremely rare phenomenon by which fraternal twins can be fathered by two different men. The term made headlines back in 2015 when a New Jersey ...

The information gathered from the study of twins lays the groundwork for future genetic research, including the degree to which any aspects of life are determined by genetics, the location of specific ...

From uncanny coincidences to shared biology, we asked the experts to explain the real forces behind the phenomenon. Twins sit near Lake Geneva in Lausanne, Switzerland. Studies suggest that the ...