A pair of identical twins now look worlds apart after one took up smoking and the other didn't, with stark physical changes ...

Identical twins are usually impossible to tell apart but a study has discovered just how much smoking can change your appearance - with tell-tale signs ...

When you’ve just had identical twins, it’s normal to spend a lot of time looking down at their squishy little bodies and analyzing every subtle way they differ from one another. Unlike fraternal twins ...

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 ...