When we think of identical twins, we often imagine mirror images — same face, same smile and perhaps even the same talents. But what surprises many is that these genetic carbon copies can have ...

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 ...

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 ...