These babies are identical twins, but their mom has no trouble telling them apart. “People say, ‘The doctors lied to you. Your twins aren’t identical,’” Danielle Marple of Venice, Florida, tells TODAY ...

I never believed in love at first sight until I met my now-husband. I couldn't recognize him from his identical twin brother over the phone. We ended up having fraternal twins, and I got to experience ...

Study of 2,000 twins shows teenage body dissatisfaction predicts adult depression and eating disorders. Social pressure, ...

Mono-mono twins are an incredibly rare type of identical twins who share both a placenta and an amniotic sac. While this makes for a high-risk pregnancy, advances in monitoring and treatment have ...

The special relationship between twins allows researchers to examine the differences between genetic and environmental influences over both physical and mental health, as well as traits and behaviors.