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

I never believed in love at first sight until I met my now-husband. I couldn't recognize him from his identical twin brother over the phone. We ended up having fraternal twins, and I got to experience ...

From Romulus and Remus—the myth of the twin brothers who founded the city of Rome—to the synchronized speech of Australia's "Twinnies" Paula and Brigette Powers, identical siblings have long inspired ...

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 ...