Duncan Green, author of "How Change Happens." He says of activism: "There has to be a little part of you that acknowledges doubt, ambiguity and uncertainty. You have to have room to change direction." Ben de la Cruz/NPR hide caption

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A demonstrator with a baseball bat crosses a bridge during a protest against the election of Donald Trump in Portland, Ore., on Thursday night. Steve Dipaola/Reuters hide caption

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A protester wearing a U.S. flag faces police during a protest Wednesday in Oakland, Calif. Thousands of protesters rallied across the United States expressing shock and anger over Donald Trump's election, vowing to oppose divisive views they say helped the Republican candidate win the presidency. Josh Edelson/AFP/Getty Images hide caption

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A student is detained by a South African policeman after he entered a building of Witwatersrand University. Protesters disrupted classes and demanded free tuition. Marco Longari/AFP/Getty Images hide caption

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Protesters, including public defender Toussaint Romain (center), march in the early hours of Friday in Charlotte, N.C. Despite a midnight curfew, police allowed the peaceful march to continue without interference. Protests began on Tuesday night following the fatal shooting of 43-year-old Keith Lamont Scott. Sean Rayford/Getty Images hide caption

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Protesters march Wednesday to protest the Tuesday shooting death of Keith Lamont Scott in Charlotte, N.C. Scott, who was black, was shot and killed by police officers, who say Scott was holding a gun and ignored instructions to drop it. Relatives and neighbors say he was holding a book. Brian Blanco/Getty Images hide caption

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Police officers face off with protesters on Interstate 85 in Charlotte, N.C., during demonstrations following the death of a man shot by a police officer on Tuesday. Sean Rayford/Getty Images hide caption

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Jedidiah Brown is removed by security during a Donald Trump rally at the UIC Pavilion in Chicago on Friday. Tasos Katopodis/AFP/Getty Images hide caption

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'This Can't Go On In Chicago,' Says Anti-Trump Protester

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Security and police officers help Pierre Plissonnier, an executive in Air France's long-haul flight unit, to climb over a fence after several hundred employees stormed into the offices of Air France on Monday. Kenzo Tribouillard/AFP/Getty Images hide caption

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Supporters of pro-democracy group "Bersih" (Clean) pass a taxi decorated with Malaysian flags as they march toward Dataran Merdeka in Malaysia's capital city of Kuala Lumpur, on Saturday. The group is protesting alleged corruption at the top levels of government. Edgar Su/Reuters/Landov hide caption

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Firefighters attempt to put out a fire at an abandoned building with the protection of St. Louis City Police in St. Louis, on Thursday. Lawrence Bryant /Reuters /Landov hide caption

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A man walks past the damaged Oxford Tavern on April 30 in Baltimore. Richard Sung Kang's liquor store and bar was hit by looters during a riot over the police-involved death of neighborhood resident Freddie Gray. The doors and windows were broken and cash and inventory stolen, leaving shelves bare. David Goldman/AP hide caption

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David Goldman/AP

For Baltimore Businesses, Aid For Riot Repair Is Not Coming Fast Enough

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Sgt. Patrick Swanton of the Waco Police Department speaks to the media as Texas Department of Public Safety Trooper D.L. Wilson (left) stands near a Twin Peaks restaurant where nine members of a motorcycle gang were shot and killed in Waco, Texas, on Tuesday. Mike Stone/Reuters/Landov hide caption

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Demonstrators snarl traffic as they try to block an entrance to the Holland Tunnel during a solidarity protest Wednesday in New York City. Michael Abbott/Getty Images hide caption

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Madison Mayor Paul Soglin addresses a crowd of protesters on Martin Luther King Boulevard in Madison, Wis., during a protest of the shooting death of Tony Robinson. Andy Manis/AP hide caption

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Racial Tension Draws Parallels, But Madison Is No Ferguson

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New York City Police Commissioner Bill Bratton speaks during an NYPD swearing-in ceremony in New York on Jan. 7. He confirmed to NPR today that there had been a work slowdown by officers in the weeks since two police officers were shot dead. He said the matter was being corrected. Seth Wenig/AP hide caption

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Seth Wenig/AP

New York Police Commissioner Confirms Work Slowdown By Officers

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First The Protest, Then The Storm: Bay Area's 5 Straight Nights Of Clashes

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