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To see the world in a grain of salt

A world-first microscopic camera promises a clear vision of the future.

A tiny clear square on a finger tip
Researchers at Princeton University and the University of Washington have developed an ultracompact camera the size of a coarse grain of salt. The system relies on a technology called a metasurface, which is studded with 1.6 million cylindrical posts and can be produced much like a computer chip. Image credit: Princeton University
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