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An anonymous reader writes "Scope: A Stanford bioengineer has developed an ultra-low-cost print-and-fold microscope and is now showing others how to make one themselves. The 50-cent lightweight, paper 'Foldscope' — which 'can be assembled in minutes, [and] includes no mechanical moving parts' — was designed to aid disease diagnosis in developing regions."
The paper describing the design is on arXiv, and a video demoing the microscope is attached below.
"It's when they say 2 + 2 = 5 that I begin to argue."
-- Eric Pepke