Nurith Aizenman

A police officer stands guard by a window riddled with bullet holes in an Ebola treatment center in Butembo, a city in Democratic Republic of the Congo. The center has been attacked twice in the last month. John Wessels/Getty Images hide caption

Assailants set fire to an Ebola treatment center run by Doctors Without Borders in Katwa, a rural suburb in Democratic Republic of the Congo, on February 25. Lauris Bonnaud/Reuters hide caption

A medical worker puts on protective gear at an Ebola treatment center in Beni in the Democratic Republic of the Congo. Officials want to train workers at all health facilities to take precautions. John Wessels/AFP/Getty Images hide caption

AIDS activist group ACT UP organized numerous protests on Wall Street in the 1980s. The group's tactics helped speed the process of finding an effective treatment for AIDS. Tim Clary/AP hide caption

A Senegalese woman wears clothing and gold jewelry inspired by the fashions of the country's powerful signares -- women who lived in the 18th and 19th century. The photo is featured in the exhibit at the Smithsonian's National Museum of African Art. Fabrice Monteiro/Mariane Ibrahim Gallery hide caption