Twin Phenomena: 20 Intriguing Facts About Twins From Across the Globe

A pair of twins were separated at birth in Ohio. When they both met, they found they had a lot more in common than their DNA. Both were named James by their families, married and divorced women named Linda, remarried to women named Betty, had sons a named James Allan and James Alan, and dogs named Toy.

In 2015, astronaut Scott Kelly became even younger than his elder twin brother (who is also an astronaut) Mark Kelly (born 6 minutes before Scott), by 3 milliseconds after the completion of his one year mission on the International Space Station.

A set of British twins separated at birth and raised by different adopted parents, fell in love and got married only to realize that they were brother and sister.

Young children, especially twins, will often develop their own language that they can understand but is unintelligible to any adult observers.

Scenes in the movie Terminator 2, where Sarah Connor and the T-1000's facsimile of her are in the same shot aren't CGI. Rather, it is Lina Hamilton and her non-actress identical twin sister, Leslie Hamilton, who acts as a very realistic body double.

There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.

Tom Berenger once owned a restaurant called Twins on the Upper East Side, where the waitstaff consisted of 29 sets of identical twins.

Fields' disease is considered the rarest known disease in the world, with only two cases diagnosed (among two twin girls named Catherine and Kirstie Fields). It causes progressive muscular degeneration, and that's about all we know. Doctors concluded that "they were probably born with it."

When one of the Siamese twin Daisy Hilton died, her sister Violet remained alive and attached to her for several days before they were both found dead.

There exists a case of conjoined twin girls named Krista and Tatiana Hogan, who are connected at the thalamus. They can hear each other's thoughts and see through each other's eyes.