It’s relatively easy to understand how optical microscopes work at low magnifications: one lens magnifies an image, the next magnifies the already-magnified image, and so on until it reaches the eye ...
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Glass failed, but the homemade microscope worked

He tried to make a microscope from raw materials, but the glass kept failing. After a second round of refining ash, sand, and ...
Add one more thing to the list of tasks your smartphone can perform. University of Houston researchers have released an open-source dataset offering instructions to people interested in building their ...