One is a Democratic city councillor, the other is an anti-immigration activist. Things got confusing when they appeared at ...

For more than a century, scientists have debated whether intelligence is mostly a product of nature or nurture. Identical twins—those born with the same genetic blueprint—have long been the perfect ...

Sarah and Aimee Charlwood from Brisbane, Australia, are identical twins. They didn't spend a day apart from when they were born until they were 16 years old. Eerie coincidences happen to them, but ...

For a few days every summer, a quaint town in Northeast Ohio turns into a living laboratory. This year, hundreds of people waited in hourslong lines to meet with researchers. Inside the tents, they ...

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...

Born three months premature, the quads spent about 10 weeks in the hospital before three of them were allowed to go home. But the fourth, a baby girl named Chesley, remained behind and died just shy ...

The 37-year-old sisters both gave birth on Aug. 26. Two twin sisters say it's "surreal" that they gave birth to their babies on the same day and in the same hospital. Identical twins Rachel ...

When she was pregnant with her twins, she says there was one specific way the doctors managed to tell the twins apart After the babies were born, Taylor admits there was more that could've been done ...