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

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

When our identical twin boys were born, we deliberately treated them as individuals. Even their closest friends struggled to tell them apart despite our efforts to differentiate them. The twins ...

VALHALLA, N.Y. -- About 11 months ago, parents Maria and Daniel Sparano welcomed their twins Emma and Nina into the world. On Monday, for the first time, the twins finally got a chance to meet since ...

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 ...

File this under extremely rare but scientifically possible: Twins born to parents of different races can look so different ...

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 ...

"It's awesome and they are so [cute] together." — -- In a happy coincidence, a pair of identical twins have given birth just 20 hours apart in the same hospital. Becky Pistone and her sister, ...