5 strange new facts about twins

A new study shows that women who bear twins live longer. And that's not the only twist in science's ever-expanding understanding of double births

Twin brothers at the annual Twins Day Festival in Twinsburg, Ohio
(Image credit: JASON REED/Reuters/Corbis)

"The fascination with twins is as old as time," says Susan Kohl in her book Twin Stories. "Twins share a strong and powerful bond that neither time nor distance seems to shake." Because of their unique relationship, twins are often the focus of research. Here's a look at five recent studies that shine new light on these linked individuals, and what they can teach the rest of us.

1. Mothers of twins live longer

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