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 ...

For '90s kids, Mary-Kate and Ashley Olsen were the dominant force in twin fiction. Over the years, other generations have been fascinated by characters like Wrigley's Doublemint Twins, or Hayley Mills ...

Twins are pretty rare, accounting for just 3% of births in the U.S. these days. But new research shows that for primates 60 million years ago, giving birth to twins was the norm. When you purchase ...