This fingertip-size microscope—which weighs a half-gram (0.02 oz.) and easily attaches to any smartphone camera lens with a nano suction pad—magnifies small objects up to 200 times. According to ...

Manu Prakash is the co-inventor of the Foldscope, a low-cost microscope aimed at making scientific tools available for everyone. We chat with him about why he wants to change how we think about ...