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 ...

There are two types of microscopes available: simple and compound microscopes. A simple microscope is equipped with one lens but a compound microscope has both an eyepiece and an objective lens.

Over the years, Prakash experimented with building microscopes, even stealing lenses from his brothers ... Over the next two years, the colleagues built 50,000 Foldscopes — they cost less ...