There’s a common assumption that intelligence is largely determined by genetics. After all, previously published studies ...

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 ...

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 ...

The mom was 20 weeks pregnant when she discovered that her twins, Graylen and Chaysen, had twin-to-twin transfusion syndrome.

CHICAGO | Identical twins Kelly McCarthy and Kristen Maurer have shared a lot in their lives so when one was diagnosed with breast cancer, she urged the other to get tested, too. "You just do ...

Twin sisters Verla Starkey, left, and Merla Swenson look at a book of their family history at their home in Kaysville on Wednesday. | Laura Seitz, Deseret News Verla Starkey and Merla Swenson like to ...