Identical twins may enter the world with the same biological building blocks, but their lives — and their health — often unfold in profoundly different ways.

How identical twins are formed. Identical twins, also known as monozygotic twins, form when a single fertilized egg, called a zygote, splits into two embryos.

Identical twins are often said to share 100% of their DNA. While this is mostly true, modern genetic technology tells a more detailed story. After the embryo splits, ...

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 ...

Identical twins separated at birth reunited 36 years later "It was the happiest moment of my life." By Tommy Brooksbank, Steve Osunsami, Elizabeth Harrison, and Stacy Rollins.

A pair of identical twins have just celebrated their 100th birthday- naming a love of sports as the secret to a long and happy life. Williams Casey — known as Bill — and his twin brother Jack ...