People raise their arms while chanting, "Hands up. Don't shoot," near where St. Louis police say officers shot and killed a 23-year-old man who was wielding a knife and refused to drop it on Tuesday. Joe Raedle/Getty Images hide caption

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Onaja Waki (left) is about to start college in California, but she and her mother, Oneida Cordova, have been talking openly for years about the dangers of sexual assault. Teresa Chin/Youth Radio hide caption

itoggle caption Teresa Chin/Youth Radio

Teachers with the Jennings School District pick up trash Tuesday on West Florissant Avenue in Ferguson, Mo., the scene of nightly police clashes. Jennings and the neighboring Ferguson school district have canceled class due to ongoing unrest. Elise Hu/NPR hide caption

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Dr. Joanne Liu (left), international president of Doctors Without Borders poses with a member of the MSF medical team at the organization's Ebola treatment center in Kailahun, Sierra Leone. P.K. Lee/Courtesy of Doctors Without Border hide caption

itoggle caption P.K. Lee/Courtesy of Doctors Without Border

Ilias Smirlis (left) runs a small family farm in Kalamata, Greece. Before he met entrepreneur Sotiris Lymperopoulos, who runs the food service Radiki, he struggled to sell his produce outside Athens. "The demand for excellent products will always exist," Smirlis says. "The challenge is to find a market." Joanna Kakissis/NPR hide caption

itoggle caption Joanna Kakissis/NPR

Smoke is seen after what witnesses said was an Israeli airstrike in Gaza City on Tuesday. Israel launched attacks in the Gaza Strip and recalled its negotiators from truce talks in Cairo after saying three Palestinian rockets had hit southern Israel, hours before a cease-fire was due to expire. Suhaib Salem/Reuters/Landov hide caption

itoggle caption Suhaib Salem/Reuters/Landov

NPR's Ebola coverage team brought a lot of cleaning equipment — not because they planned to go into risky places but because you can never be too careful. The boots are very handy and can be washed with chlorine. Wearing surgical gloves reminds our correspondent not to touch her face. Ryan Kellman/NPR hide caption

itoggle caption Ryan Kellman/NPR

Pope Francis celebrates a Mass of reconciliation in Seoul's main cathedral on Monday. The wife and children of Francis' nephew have died after a car accident in Argentina, the Vatican reports. Gregorio Borgia/AP hide caption

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Louis E. Pratt, master ivory cutter for Pratt, Read & Co., shows off eight ivory tusks, April 1, 1955. Courtesy of Deep River Historical Society hide caption

itoggle caption Courtesy of Deep River Historical Society

In what could be a first, Mariela Castro (center), daughter of Cuban President Raul Castro, voted against legislation in the country's parliament. In May, she marched in a parade for the International Day Against Homophobia in Havana. Franklin Reyes/AP hide caption

itoggle caption Franklin Reyes/AP

A picture taken with a smart phone shows Syrian refugees queuing at one of the many UNHCR (United Nations Refugee Agency) registration centers in Lebanon. At the same time that civil wars and the Ebola outbreak are plaguing countries in Africa, Syrian and Iraqi refugees are seeking help from agencies. Joseph Eid/AFP/Getty Images hide caption

itoggle caption Joseph Eid/AFP/Getty Images