Audiovisual documents, such as films, radio and television programs, are our common heritage and contain the primary records of the history of the 20th and 21st centuries. Unfortunately, that heritage is now endangered, because sound recordings and moving images can be deliberately destroyed or irretrievably lost as a result of neglect, decay and technological obsolescence.

Though doctors now know the causes and implications of a stroke, the condition hasn’t always been well understood. Hippocrates, the “father of medicine,” first recognized stroke more than 2,400 years ago. He called the condition apoplexy, which is a Greek term that stands for “struck down by violence.” While the name described the sudden changes that can occur with a stroke, it didn’t necessarily convey what’s actually happening in your brain.

According to PC Magazine, a touch screen is, "a display screen that is sensitive to the touch of a finger or stylus. Widely used on ATM machines, retail point-of-sale terminals, car navigation systems, medical monitors and industrial control panels, the touch screen became wildly popular on handhelds after Apple introduced the iPhone in 2007."