Read Books Without Opening Them!!

There is a new device that can read closed books by using terahertz radiation to penetrate through the surfaces.

Credit: Barmak Heshmat

 

researchers said it could help spies read mail without opening envelopes. 

 

The prototype device uses terahertz radiation, the band of electromagnetic radiation between microwaves and infrared light. Previous research has found that terahertz rays, or T-rays, possess a number of advantages over X-rays, ultrasound waves and other kinds of radiation that can penetrate surfaces. 

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