Twins have been rare in human history and for that reason can seem special. Many cultures associate twins with health and ...

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 ...

Twins, triplets, and other multiples have long caught the attention of “singletons,” or those of us born without a built-in best friend by our sides. Twins—and the media—annually descend on Twinsburg, ...

Amid a sharp increase in twin (multiple-fetus) pregnancies and births in South Korea, there have been calls for policy shifts to reduce the risks associated with twin births for mothers and fetuses.