A Lebanese woman covers her nose as she walks past piles of garbage on a Beirut street. Hassan Ammar/AP hide caption

itoggle caption Hassan Ammar/AP

Mineral supplements, ape-style: A female chimp called Kana eats clay in the Budongo Forest of Uganda. A.Schel/Budongo Conservation Field Station/Animal Ecology, Utrecht University, The Netherlands hide caption

itoggle caption A.Schel/Budongo Conservation Field Station/Animal Ecology, Utrecht University, The Netherlands

In this 16th-century painting, Saint Benedict exorcises a demon from a man possessed. Alfredo Dagli Orti/The Art Archive/Corbis hide caption

itoggle caption Alfredo Dagli Orti/The Art Archive/Corbis

The bar chart tells all: That's how eighth-graders at Bakgatle Community Junior Secondary School in Botswana can compare the HIV infection rate of older men and of teenage boys. Don Boroughs for NPR hide caption

itoggle caption Don Boroughs for NPR