They do have two "birthmarks" that enable others to tell them apart: Jocelyn has a scar next to her right eye from a fall when she was two years old and Jennifer has a mole on her chin from a childhood bout with chicken pox.

But Jennifer says that people at Harvard tell them apart in the most "unique" ways she has ever seen.

"They will say, 'Jocelyn walks differently, Jocelyn walks bigger, Jocelyn smiles more'" and not even pay attention to the birthmarks, Jennifer says.

Jocelyn and Jennifer say these clever identification techniques should not be necessary; they don't think they look alike at all.

"Everyone asks, 'How do people tell you apart?"' Jocelyn says. "My common response is, 'We don't look alike.'"

Jennifer agrees.

"I don't think we look alike," she says. "When I look at her, I don't see myself."

Their personalities are also different, the sisters say.

"She's a little bit more outgoing than I am," Jennifer says. "I'm a little shy sometimes. She's a little bit more feisty than I am. She's definitely going to make sure her point is heard."

And Jocelyn says she generally agrees with people who say she is the more aggressive and open twin. She also says that Jennifer mothers her: "She's very concerned about how I am, and she makes sure I do everything that's good for me."

Although people who do not know them well some-times confuse them, men who are interested in one or the other can easily tell them apart, both twins say.

"In the beginning, if they just started going out and he doesn't know how she talks, I can confuse him a little," Jocelyn says.

But "guys, when they see twins, they look beyond that, and find the difference," says Jennifer.

The two say they differ in more than looks. For example, this year the pair did have different preferences in the housing lottery.

"Jocelyn wanted to be in Currier. I wanted to be in North. So they stuck us in Cabot," Jennifer says.