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 ...

The Science of Siblings is a new series exploring the ways our siblings can influence us, from our money and our mental health all the way down to our very molecules. We'll be sharing these stories ...

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

It’s a tale of two twins. Twins Jevon and John Whittington are identical – down to their height (5’6″), weight and what they eat. Then they decided to go on a polar opposite diet for science: one went ...

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 ...

After believing that her daughters were fraternal twins for so long, a mom was stunned when a genetic test revealed otherwise. Not long after Tamara Vanderent, 30, discovered that she was expecting ...