How MIT's Terahertz camera can read/scan closed books?

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asked Oct 7, 2016 in Smart Gadgets by Jian Yang (590 points)  
Last month, I read about a new invention that widely spread in the magazine. MIT's posted in nature communication regarding a device, which has a capacity to scan closed books. This kind of technology we have seen in Rajinikanth 'Endiran' movie. Sound amazing! I really want to know, what kind of camera is used in the project? How this actually works? What kind of equipment is used in the smart gadget?
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