Microphone Lens turns your iPhone or Android camera phone into a portable microscope. Can be used to take pictures of nanoparticles and viruses, possibly providing a portable diagnostic tool for health care workers in developing countries. By clipping on a 3D-printed attachment that included a laser bought on eBay, the device can be attached to the back of a smart phone to turn it into a fluorescence microscope. Researchers at the University of California (UCLA) are funded by Nokia university research funding, the Army Research Office, the National Science Foundation, and other sources.
Source: https://thehackernews.com/2013/09/turning-your-iphone-or-android-camera.html