What Twins Tell Us

Most of us have ideas about what we’re looking for in a romantic partner. But psychologist Paul Eastwick says these preferences are surprisingly poor guides for finding love. He explains why attraction is so difficult to predict, and what the research suggests is the best way to ...  Show more

Why is my friend late? How does nuclear fission work? What can I do to help my baby sleep through the night? We all feel the need to understand why certain things happen. Some researchers think the drive to explain the world is a basic human impulse, similar to thirst or hunger. ...  Show more

From movie plots to ad campaigns to viral videos, if they feature twins, they grab our attention every time. But it’s not only the general public who are fascinated with twins. Over many decades, twins have garnered attention from psychologists and other researchers because of wh ...  Show more

Twins have always fascinated us but is there more to their connection than just being double trouble for their poor parents and a puzzle to the rest of us if we're trying to tell them apart. 

Does our genetic code matter more than our environments? Join CNN's Chief Medical Correspondent Dr. Sanjay Gupta as he wrestles with the age-old nature-nurture debate. First, Sanjay brushes up on genetics 101 with Dr. Ruth Tennen. Then, he discusses what studying twins can teach ...  Show more