Despite efforts to reduce pedestrian deaths, many cities have become more dangerous for walkers in recent years. Alessandro Scagliusi / EyeEm/Getty Images/EyeEm hide caption

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Alessandro Scagliusi / EyeEm/Getty Images/EyeEm

A fence surrounds an estate in the village of Upper Brookville in the town of Oyster Bay, N.Y., on Long Island. On Friday, the Obama administration closed this compound for Russian diplomats, in retaliation for spying and cyber-meddling in the U.S. presidential election. Alexander F. Yuan/AP hide caption

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Alexander F. Yuan/AP

Officials escort Adnan Syed from the courthouse in Baltimore on Feb. 3 after the first day of hearings for a retrial. A judge granted the new trial, but on Thursday he denied Syed's motion to be released while he waits for the retrial. Baltimore Sun/TNS via Getty Images hide caption

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Baltimore Sun/TNS via Getty Images

Mechanical failure is speculated as the likely cause of the Christmas plane crash that killed 92. Vladimir Velengurin/AP/Russian Emergency Ministry Press Service hide caption

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Vladimir Velengurin/AP/Russian Emergency Ministry Press Service

The top 20 most popular stories from the past year ranged from fact checks to mosquito bites, from Aleppo to taxes, and how to raise kids who will thrive, whatever the future brings. (From left) Jim Watson/AFP/Getty Images; Felipe Dana/AP; Joe Raedle/Getty Images; Phelan M. Ebenhack/AP hide caption

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(From left) Jim Watson/AFP/Getty Images; Felipe Dana/AP; Joe Raedle/Getty Images; Phelan M. Ebenhack/AP

U.S. Secretary of State John Kerry laid out his vision for peace between Israel and the Palestinians Wednesday. In the more than hourlong address, Kerry criticized Jewish settlements in the West Bank as an impediment to peace. Paul J. Richards/AFP/Getty Images hide caption

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Paul J. Richards/AFP/Getty Images

The Washington Post set records for traffic and digital advertising revenue in 2016. The Post moved to this new building on Washington's K Street in December 2015. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images

Peggy O'Neill stands outside Edmunds Elementary and Middle Schools in Burlington, Vt. She was one of the strongest advocates for the bike lane in her city but met a lot of resistance. Laurel Wamsley/NPR hide caption

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Laurel Wamsley/NPR

With Citizens' Help, Cities Can Build A Better Bike Lane — And More

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