Pregnancy is a unique experience, and there are distinct differences between twin birth and the birth of a single baby. In the womb, twins grow side by side, but their development may not always be ...

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 ...

A CT scan of an ancient marine reptile that was entombed while pregnant has revealed a huge surprise — there were two fetuses inside her fossilized remains. "Twins! She has another baby," Judith Pardo ...

Tesla Monson receives funding from the Leakey Foundation, the National Science Foundation, and Western Washington University. Jack McBride has previously received funding from Western Washington ...