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

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

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 ...

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

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

Identical twins Robyn and Scarlett Atherton will share many experiences in life but never the same birthday. For Robyn arrived at 11.55pm on November 9 weighing 4lbs 5oz while her 5lb 11oz sister was ...

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 ...

Identical twins from Las Vegas just got a lot closer in Los Angeles. The 56-year-old sisters, Linda Thomas and Karen Rodman, were “feeling well and gratefully celebrating the holiday with their ...