This paper microscope is simply brilliant design.
IF EVER a technology were ripe for disruption, it is the microscope. Benchtop microscopes have remained essentially unchanged since the 19th century—their shape a cartoonist’s cliché of science akin to alchemical glassware and Bunsen burners. And that lack of change has costs. Microscopes are expensive (several hundred dollars for a reasonable one) and need to be serviced and maintained. Unfortunately, one important use of them is in poor-world laboratories and clinics, for identifying pathogens, and such places often have small budgets and lack suitably trained technicians. (via Cheap microscopes: Yours to cut out and keep | The Economist)