There’s a common assumption that intelligence is largely determined by genetics. After all, previously published studies found that identical twins raised apart—who share nearly identical DNA—tend to ...

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

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

When identical twins Chaysen and Graylen were in their mother Jessica Proudfoot’s womb, doctors discovered the beginning of ...