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 ...

Mirror twins share reflection-like traits, from birthmarks to handedness. Here’s what that means – and why it’s more fun fact than medical label.

Are we destined to be smart? Twin studies reveal strong genetic roots for IQ, yet up to a third of intelligence is shaped by environment, context, and choice.

"It's awesome and they are so [cute] together." — -- In a happy coincidence, a pair of identical twins have given birth just 20 hours apart in the same hospital. Becky Pistone and her sister, ...

The 61-year-old sisters both got deep plane facelifts on the same day by the same Florida-based plastic surgeon Here they share a candid look at the process — from what sparked their decision to go ...

A set of rare conjoined twins was successfully separated this past February after an 18-hour surgery that required a team of ...

Alisha Openshaw documented her journey navigating her twin sons' rare situation on social media, gaining followers and ...