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 ...

Paper aeroplanes are the extent of most people’s origami skills, and even then there’s no guarantee they’ll actually be able to fly further than your hand. Get a bit more creative and there are ...