A case for blended learning. "Students today are surrounded by media: cell phones, smartphones, multiple televisions, MP3 players, movies, computers, video games, iPads, e-mail, and the Internet. Eight- to 18-year-olds spend an average of seven hours per day with digital media...Sure, we can walk and chew gum at the same time because they are separate physical tasks requiring no measurable cognitive input. However, the brain cannot carry out two cognitive processes simultaneously. Our genetic predisposition for survival directs the brain to focus on just one item at a time to determine whether it poses a threat. If we were able to focus on several items at once, it would dilute our attention and seriously reduce our ability to make the threat determination quickly and accurately."