"I think we're just like one person." - Bridgette and Paula Powers. This year, Insight celebrates its 10th anniversary as a discussion forum. Over that time, more than 17,000 people have come to SBS, and shared their stories on the program. So, we're celebrating by re-visiting some of our most memorable shows. This week, we're going back to 2006, when a group of 22 identical pairs of twins let Insight in on the secrets of being a twin. What's it like to share not only your face, but maybe also your thoughts and dreams? That's a question only identical twins can answer. Studies of identical twins, with their identical DNA, have led to some startling findings about nature and nurture. They are the perfect genetic design for studying what makes us the way we are. Twin studies reveal that our behaviour, our health and most things about us, have a lot more to do with our genes than we used to believe. Even our personality is around 50% inherited.