Assembling a<unk> <unk>  design, components and usage.(A) CAD layout of<unk>  paper components on an A4 sheet. (B) Schematic of an assembled<unk>  illustrating panning, and (C) cross-sectional view illustrating flexure-based focusing. (D)<unk>  components and tools used in the assembly, including<unk>  paper components, ball lens, button-cell battery, surface-mounted LED, switch, copper tape and polymeric filters. (E) Different modalities assembled from colored paper stock. (F) Novice users demonstrating the technique for using the<unk> . (G) Demonstration of the field-rugged design, such as stomping under foot. A<unk>  is an optical microscope that can be assembled from simple components, including a sheet of paper and a lens. It was developed by Manu Prakash and designed to cost less than one USD to build. It is part of the "frugal science" movement which aims to make cheap and easy tools available for scientific use in the developing world.
Foldscope
Hot flash
Nasal voice
Saddle nose
Arriscope 
Kussmaul breathing
Hypnic jerk
Muscle tension dysphonia