For the longest time, imaging was probably the most boring subject imaginable. Unless you were excited about comparing various mass-produced, brand-name lenses, there wasn't much to talk about. That changed briefly with the invention of the laser, but the actual imaging technology was still... yeah, boring.
In the last decade or so, though, things really have changed, in part because of new ways of thinking about what an image actually is. Among the many fascinating variations on traditional imaging is something called ghost imaging. The idea of ghost imaging was to use the quantum nature of light to image an object by detecting photons that had never actually encountered the object. This is a mind-blowing idea that has now been developed to the point where it might actually be practical in some circumstances—especially when you can acquire about 1,000 ghost images per second.
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