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 ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Sean Anthony Eddy via Getty Images A microscope’s job is to magnify the minuscule world ...

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