At any given moment, there are two of you. How is this possible, you may wonder? Well, ask Albert Einstein or Stephen Hawking. Slight problem, they aren't here. But, they did leave us with the science that can help explain the realities of digital presence. To dumb it down for all of us, there are multiple existences that are active via social media and all forms of 21st-century technology simultaneously. And on the other hand, we can't forget about our real selves either. How do these two se...