Yonta, 6, rests with her sister Montra, 3, and brother Leakhena, 4 months, under a mosquito bed net during monsoon season in July 2010, in Pailin province, Cambodia.
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Fake medicines are a 21st-century scourge, but they've been around for a long time. This advertising trade card for snake oil was printed in New York City around 1880.
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The effects of malaria in the brain are clear: A healthy brain, right, has many grooves and crevices. But when the brain swells up, left, these crevices smooth out.
Courtesy of Michigan State University