Yale University

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In this May 17, 2015, file photo, Vice President Joe Biden gestures after donning a pair of sunglasses as he delivers the Class Day Address at Yale University in New Haven, Conn. (AP Photo/Jessica Hill, File)

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This Sept. 9, 2016, photo shows Harkness Tower on the campus of Yale University in New Haven, Conn. (Associated Press)

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This Sept. 9, 2016, file photo shows Harkness Tower on the campus of Yale University in New Haven, Conn. (AP Photo/Beth J. Harpaz)

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This Dec. 9, 2007 photo released by Yale University shows J.D. McClatchy, a longtime editor of The Yale Review, one of the world's oldest literary publications, in New Haven, Conn. McClatchy, a prize winning poet and librettist, said he is leaving The Yale Review, effective at the end of this month. (Yale University via AP)

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FILE - This Sept. 9, 2016 photo shows Harkness Tower on the campus of Yale University in New Haven, Conn. A study of 800 colleges found that the average endowment return was a 2 percent loss, the worst performance since the economic recession in 2009. The largest endowments were among those hit hardest, including Harvard’s, which posted a 5 percent loss but remained the biggest at $34 billion. Yale’s remained No. 2 with $25 billion. (AP Photo/Beth J. Harpaz, File)

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Yale University alumnus Dr. Benjamin Carson, President-elect Donald Trump's pick for secretary of the U.S. Department of Housing and Urban Development, speaks at Yale, Thursday, Dec. 8 as a guest of the William F. Buckley Jr. Program at Yale. (AP Photo/Stephen Dunn)

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Yale University students wear a variety of head coverings during Class Day at Yale in New Haven (AP Photo/Jessica Hill)

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CONNECTICUT $678K -Future graduates line up for commencement on campus of Yale University in New Haven, Conn., Monday, May 20, 2013. (AP Photo/Jessica Hill)

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Students listen as Secretary of State John Kerry delivers the Class Day address at Yale University, Sunday, May 18, 2014, in New Haven, Conn. (AP Photo/Jessica Hill)

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Miriam Rock of Philadelphia, left, and Jack Shu of Potomac, Md., right, react as Secretary of State John Kerry delivers the Class Day address at Yale University, Sunday, May 18, 2014, in New Haven, Conn. (AP Photo/Jessica Hill)

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Secretary of State John Kerry, right poses for a selfie with Yale student Ariel Kirshenbaum during Class Day at Yale University, Sunday, May 18, 2014, in New Haven, Conn. (AP Photo/Jessica Hill)