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Gemini is one of the constellations of the zodiac. It was one of the 48 constellations described by the 2nd century AD astronomer Ptolemy and it remains one of the 88 modern constellations today. Its name is Latin for "twins," and it is associated with the twins Castor and Pollux in Greek mythology.

Actors Tia and Tamera Mowry of the popular '90s sitcom "Sister, Sister" star in a reality series that documents their lives as they embark on new journeys and face their biggest challenges yet -- from pregnancies to weddings and how those events change their lives. At crossroads, they learn how to balance their careers with the pressures of their personal relationships and expanding responsibilities. But as the sisters' parenting and professional lives take them in different directions, the audience will see whether or not their relationship survives the challenges.

In the notoriously competitive world of sports, competition can be dog-eat-dog. And while football player twins Tiki and Ronde Barber are notoriously competitive against other teams, with each other they’re inseparable — and, indeed, rather complementary. The two were born seven minutes apart and five weeks early, and they’ve lived a determined, inseparable existence ever since. Both tore up the field at the University of Virginia, and with Tiki at running back and Ronde at cornerback, the Cavaliers headed to four consecutive bowl appearances while the twins were in school there.