We have all seen twins, some of us even have one! While whenever the word "twins" come to our mind, we think of fraternal or identical pairs. But did you know that there are many other types and ...

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 ...

This story appears in the January 2012 issue of National Geographic magazine. Every summer, on the first weekend in August, thousands of twins converge on Twinsburg, Ohio, a small town southeast ...

Fraternal twins can look alike as much as two siblings can look alike. Again, fraternal twins are not identical and do not share the same chromosomes and genes.

Everyone’s different. We all look different (apart from identical twins), we all think differently, and we all have different personalities. Some differences are more obvious than others.

These three sets of identical twins look as alike as peas in a pod, with striking looks and perfect skin. But the amazing ultra-violet photographs of their faces tell a different story, revealing ...