A commemoration ceremony is held for the victims of the Sept. 11 terrorist attacks on Sunday at the National September 11 Memorial and Museum in New York City. Spencer Platt /Getty Images hide caption

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Russell Mercer replaces old U.S. flags with new ones at the Flushing World Trade Center Memorial at Flushing Cemetery in New York City. His stepson, Scott Kopytko, was killed on Sept. 11. Alex Welsh for NPR hide caption

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Alex Welsh for NPR

Sept. 11 Families Face 'Strange, Empty Void' Without Victims' Remains

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A construction worker looks up at One World Trade Center in New York City, the central skyscraper under construction at Ground Zero, a year before its 2013 completion. Spencer Platt/Getty Images hide caption

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For Those Who 'Worked The Pile' At Ground Zero, Horrors Of Sept. 11 Haven't Faded

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People look out at the former site of the World Trade Center in New York City in 2005, where construction had started on Freedom Tower. Spencer Platt/Getty Images hide caption

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Three World Trade Center is under construction near One World Trade Center, which was completed in 2013. The new building stands 1,079 feet tall, and its topping-out ceremony was held in June. Hansi Lo Wang/NPR hide caption

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In Ongoing Rebuilding Of Ground Zero, A Balance Of Remembrance, Resilience

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Eric Frumin (right) stands in front of his solar panels on the roof of his Brooklyn home alongside architect David Cunningham (left) and AeonSolar's Allen Frishman (center). Courtesy of Eric Frumin hide caption

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Courtesy of Eric Frumin

A CD-ROM containing two spreadsheets with names that New York City Board of Elections officials say were purged from voter rolls. Brigid Bergin/WNYC hide caption

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Why Voter Rolls Can Be A Mess

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Trinity Church archivist Anne Petrimoulx stands in front of Alexander Hamilton's grave in New York City. The site has seen a surge in visitors following the popular Broadway musical, Hamilton. Melissa Block/NPR hide caption

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'Hamilton' Fans Pilgrimage To Founding Father's Once-Forgotten Grave

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Secretary of the Interior Sally Jewell speaks in front of the Stonewall Inn in 2014 to announce a National Park Service initiative to identify historic sites related to the struggle for LGBT rights. Spencer Platt/Getty Images hide caption

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Long A Symbol, Stonewall Inn May Soon Become Monument To LGBT Rights

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High school students perform 10467, a play they wrote about how their education has been affected by lack of resources. Beth Fertig/WNYC hide caption

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NYC Teens Spotlight School Funding Woes On Stage

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Former professional boxer, Iran Barkley, poses in front of his Bronx apartment complex. Barkley, a former WBC middleweight champion, became homeless after facing financial troubles in the later years of his life. He currently is a board member of Ring 10 Veterans Boxing Foundation of New York, an organization that works with boxers who are down on their luck. Cameron Robert/NPR hide caption

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To Fight Off Hard Times, Former Boxers Enter A 'Ring' Of Support

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Supporters of Akai Gurley's family gather outside the courthouse where former New York City police officer Peter Liang was sentenced for Gurley's shooting death in Brooklyn, N.Y. Hansi Lo Wang/NPR hide caption

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In this Feb. 20 photo, protesters attend a rally in Brooklyn, New York, in support of former NYPD police officer Peter Liang, who was convicted of manslaughter for the 2014 shooting death of Akai Gurley. Craig Ruttle/AP hide caption

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A luxury residential building at 432 Park Ave. (center) is seen in the Manhattan skyline. Rents have soared as demand for apartments outpaces the number available, even with the oversupply of expensive apartments. Seth Wenig/AP hide caption

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Seth Wenig/AP

ISO 2 Affordable Bedrooms In NYC? Good Luck With That

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A New York judge has ruled that items like Panera's Bacon Turkey Bravo Sandwich on Tomato Basil bread, which contains 2,850 milligrams of sodium, require a warning label. Jesse Grant/Getty Images for IMG hide caption

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Judge Rules NYC Can Require Sodium Warnings On Restaurant Menus

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Lily Cheung teaches Mandarin to Greg Wong (left), Lt. Charles Flores (right) and other New York City firefighters, EMTs and paramedics at an old firehouse. The city is predicting that Chinese residents are likely to become New York's largest immigrant group in the next few years. Hansi Lo Wang/NPR hide caption

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For NYC Firefighters Learning Mandarin, Service Starts With 'Ni Hao'

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