Remember all those paper airplanes you used to make as a kid when you were bored in class. What about all the newspapers that you still (maybe?) read as an adult? Once upon a time on the train, there would be this constant rustle and shuffling as The Wall Street Journal, The New York Times, and USA Today were folded and pressed on people's laps. Today, it's more likely to be a train car full of tablets and neon blue screens - much more efficient and less disruptive for your neighbor. But I still bet you wouldn't mind jumping on a paper airplane and flying away.