Sarah and Aimee Charlwood are identical twins who didn't spend a day apart until they were 16.Courtesy of Sarah Charlwood Sarah and Aimee Charlwood from Brisbane, Australia, are identical twins. They ...

For more than a century, scientists have debated whether intelligence is mostly a product of nature or nurture. Identical twins—those born with the same genetic blueprint—have long been the perfect ...

Add Yahoo as a preferred source to see more of our stories on Google. A century’s worth of twin data reveals that when schooling differs, identical twins’ IQs can diverge as much as unrelated people’s ...