For more than a century, scientists have debated whether intelligence is mostly a product of nature or nurture. Identical ...

A set of identical twins are thriving after life-saving surgery was performed on them while they were still in the womb.

Sarah and Aimee Charlwood are identical twins. They didn't spend a day apart until they were 16. They share the same ...

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...

When we think of identical twins, we often imagine mirror images — same face, same smile and perhaps even the same talents. But what surprises many is that these genetic carbon copies can have ...

Born three months premature, the quads spent about 10 weeks in the hospital before three of them were allowed to go home. But the fourth, a baby girl named Chesley, remained behind and died just shy ...

Identical twins Mairéad Lyons and Thérèse Walsh have always had a very close bond but it reached a new level when both of ...

A mom of two boys from Perth, Australia, who tried for a girl wasn't prepared for the unexpected twist in her family plans.