MIT Invented a Camera That Can Read Closed Books

In a breakthrough that will appeal to both spies and those who work with priceless but frail historical documents, researchers at MIT have developed a camera that uses terahertz radiation to peer at the text on pages of a book, without it having to be open.
Read more: https://gizmodo.com/mit-invented-a-camera-that-can-read-closed-books-1786522492?source=Snapzu