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

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 ...

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 ...

There’s both fact and fiction to the rumors that twins run in families and tend to skip a generation. Here’s how heredity impacts your odds of conceiving twins.

Most twins have two identities: The one they share with their twin brother or sister as part of a pair, and the one that they enjoy all on their own. Most twins enjoy being a twin since it is a ...

Identical twins who were raised apart may have IQ differences similar to those of total strangers, according to new research.

A study on Botox labeled as “groundbreaking” compared the evolution of two identical twins, with one receiving constant injections over 13 years and the other aging as nature intended. Pictures of the ...