Eight-year-old S. Hariraj is a Foldscope devotee. He's used it to look at the milk from the cows his parents raise. Though the milk looks creamy, the Foldscope reveals a world of microorganisms. "It ...

Students at Eden School in northern India prepare specimens they've collected to examine in the Foldscope. The paper microscope, invented a decade ago, is given for free for schools in lower resource ...