This new imaging system can read closed books

They say you shouldn't judge a book by its cover, but a new imaging system from MIT can see right through the cover and read the book while it's still closed.That's thanks primarily to terahertz radiation, the band of electromagnetic radiation between microwaves and infrared light, and the tiny gaps of air between the pages of any closed book.Terahertz radiation can distinguish between ink and blank paper in a way that X-rays can’t, and it also offers much better depth resolution than ultr