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Clinton's Free Tuition Promise: What Would It Cost? How Would It Work?

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Donald Trump makes a campaign stop in Scranton, Pa., on Wednesday. He faced a day of harsh criticism from across the political spectrum for appearing to urge Russia to hack his Democratic rival's email. John Moore/Getty Images hide caption

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Clarissa Rodriguez of Texas, 17, and Ruby Gilliam of Ohio, 93, deliver the Pledge of Allegiance during the first day of the Democratic National Convention in Philadelphia on Monday. They are the youngest and oldest delegates at the convention. J. Scott Applewhite/AP hide caption

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DNC's Oldest Delegate's Life Spans Early Days Of Suffrage To Historic Nomination

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Scientists using a high-resolution X-ray technique found that this bone belonging to a hominin, an ancient, extinct relative of modern humans, has a malignant tumor. Patrick Randolph-Quinney (UCLan) hide caption

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California Gov. Jerry Brown speaks at the Democratic National Convention in Philadelphia on Wednesday. Bill Clark/CQ Roll Call hide caption

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California Gov. Jerry Brown On The Power Of Outsider Politics

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Cookie dough clings to the beaters of a standing mixer. The Food and Drug Administration is warning people not to eat raw dough due to an ongoing outbreak of illnesses linked to flour tainted with E. coli. Larry Crowe/AP hide caption

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Smoke rises over Saif Al Dawla district in Aleppo, Syria, in 2012. Russia and the Syrian government say they will open humanitarian corridors in Aleppo and offer a way out for opposition fighters wanting to lay down their arms, Russian Defense Minister Sergei Shoigu said Thursday. Manu Brabo/AP hide caption

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This undated photo was taken of John Hinckley Jr. in front of the White House. He attempted to assassinate President Ronald Reagan in D.C. on March 30, 1981. AFP/AFP/Getty Images hide caption

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A typical Native American oyster deposit, or midden, dating to about 1,000 years ago. Archaeologists are finding clues to sustainable oysters harvesting in these remains. Torben Rick/Smithsonian Institution hide caption

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"There is plenty of room at the bottom": An excerpt from a landmark 1959 lecture by physicist Richard Feynman is written on a sheet of copper with chlorine atoms. Otte Lab/Delft University of Technology hide caption

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President Obama and Hillary Clinton stand together on stage on the third day of the Democratic National Convention in Philadelphia. Justin Sullivan/Getty Images hide caption

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Women often save up questions for an annual office visit that they think don't warrant a sick visit to the doctor during the year, research finds. Tim Pannell/Fuse/Getty Images hide caption

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Chief David Beautiful Bald Eagle during the opening of the Days of '76 Museum in Deadwood, S.D. Bald Eagle died on Friday at the age of 97. Tom Griffith/Rapid City Journal via AP hide caption

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David Bald Eagle, Lakota Chief, Musician, Cowboy And Actor, Dies At 97

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Chelsea Clinton stands behind her mother after Hillary Clinton won the New York Democratic primary in April. Justin Sullivan/Getty Images hide caption

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Listen To NPR Special Coverage Of The Convention

Clinton was the first student to deliver a commencement speech at Wellesley College in 1969. Her criticism of Sen. Edward Brooke's speech received national attention. John M. Hurley/Boston Globe via Getty Images hide caption

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Taking On A U.S. Senator As A Student Propelled Clinton Into The Spotlight

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