Woman Becomes Pregnant While Already Pregnant

A woman in Arkansas became pregnant with a male fetus while already two and a half weeks pregnant with a female fetus. Superfetation, while rare, occurs occasionally in humans when a woman ovulates more than once in a month, occasionally resulting in the release of an egg while the woman is already pregnant. [MSNBC … » 9/25/09 4:30pm 9/25/09 4:30pm