Every morning, many of us crowd onto the Boston subway to get to work. Many of us spend the trip with our nose in a book, our eyes fixed on our smart phone as we start in on emails (or sneak in the occasional game) or just zoning out a bit before another day of hard work at our startup. What you may not realize is how much startup activity is all along the same line: the Red Line is packed with Innovation. Let's take a look...