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Christine Koh and her daughters. Christine Koh hide caption

Two businessmen reach to shake hands across a red line. Gary Waters/Getty Images/Ikon Images hide caption

A boy carries a sack of grain from a dugout canoe to shore in the village of Ambohitsara in eastern Madagascar, characterized as a low-income country by the World Bank. Samantha Reinders for NPR hide caption

A boy carries a sack of grain from a dugout canoe to shore in the village of Ambohitsara in eastern Madagascar, characterized as a low-income country by the World Bank. Samantha Reinders for NPR hide caption

Rohingya refugees collect drinking water from a pump in a camp in Bangladesh. Aurélie Marrier d'Unienville hide caption

Rohingya refugees reach out for food donations at the Kutupalong camp in southern Bangladesh. Tommy Trenchard/Caritas hide caption

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When does food aid work? Hanna Barczyk for NPR hide caption

The black-legged tick, ixodes scapularis, can spread Lyme disease. Smith Collection/Gado/Getty Images hide caption

Somali children walk to a food distribution on the outskirts of Mogadishu on April 9. Mohamed Abdiwahab/AFP/Getty Images hide caption

A boy from a tribe in Northern Kenya stands on a dried-up river bed. Christopher Furlong/Getty Images hide caption

They had the right idea: During the worldwide flu epidemic that began in 1918, women in this U.S. office wore cloth masks. Bettmann/Bettmann Archive hide caption

A pig stands in a pen at an antibiotic-free pig farm in Tongxiang, China. Bloomberg via Getty Images hide caption

Hayat Kheir Imriri took out a microloan of $800 to buy stock for her store in a refugee camp for Palestinians in Beirut, Lebanon. Sam Tarling/Corbis via Getty Images hide caption

An image of the Ebola virus taken by an electron microscope. Scott Camazine/Getty Images/Science Source hide caption