Princeton University professor John Nash speaks during a news conference at the university in Oct. 1994 after being named the winner of the Nobel Prize for economics. Charles Rex Arbogast/AP hide caption

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Developing a vaccine for meningitis B was tricky. Even the existing vaccine doesn't protect against all B strains. Josef Muellek/ hide caption

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The Ivy League school has begun vaccinating nearly 6,000 students to try to stop an outbreak of type B meningitis in an unusual federal government-endorsed administration of a drug not generally approved for use in the U.S. Mel Evans/AP hide caption

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