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 ...

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 ...

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 ...