Back in the 1960s, Canadian media scholar Marshall McLuhan told the world that “the medium is the message,” by which he meant that content was far less meaningful than the form in which that content was delivered. If you’re reading, McLuhan felt, your brain is operating in a specific way, regardless of whether you’re reading Ulysses or the latest Penthouse Forum. If you're watching moving images on your television, your brain is operating in a fundamentally different way. There are profound implications for what you’ll retain and how your mind will work in the future.