A Zambian man holds up his HIV negative test results.
Children receive the oral polio vaccine from a vaccination team going house to house in Kano, Nigeria.
A premature baby is cared for in the pediatric ward at a hospital in Addis Ababa, Ethiopia.
This Tanzanian sweet potato farmer teaches other farmers in the region about soil irrigation, increasing crop yields, and how to sell surplus crops at the market.
Seventh and eighth grade students build and play with robots at McLane Middle School in Brandon, Florida.
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Health workers have helped to decrease child mortality rates in Ethiopia.