Although there are some rare exceptions, identical twins are almost always the same sex. Because identical twins occur when a single fertilized egg splits and forms two embryos, each embryo has the ...

What's the meaning of fraternal twins? Fraternal twins come from two separate, fertilized eggs that develop in the womb at the same time, each with their own placenta and amniotic sac. Like any ...

It was my third pregnancy, and when my bump grew faster, I assumed it was because I had done this before. It turned out I was pregnant with twins. They refused to take a DNA test now as adults to find ...

The birth of twins in all human populations is puzzling because the female uterus is designed to carry just one fetus. Multiple birth pregnancies have higher frequencies of serious physical and health ...

Fascination with twins and what twin studies tell us about human nature is universal. There is no question that behavioral and medical science advances have happened largely because twins yield a ...

Twins have long been studied to understand autism causes. — -- When Jenn Medvin asked her daughter, Avery, what she wanted to be as an adult, the 6-year-old gave a range of answers from doctor to ...

Jeffrey Craig has received funding from the National Health and Medical Research Council. He is the Patron of the Australian Multiple Birth Organisation, and a Member of the International Society of ...

From Romulus and Remus—the myth of the twin brothers who founded the city of Rome—to the synchronized speech of Australia's "Twinnies" Paula and Brigette Powers, identical siblings have long inspired ...