“Simplify,” Henry David Thoreau tells us in Walden. I am reading this advice in the airport, awaiting a jet plane excursion, just moments after downloading a 464-page collection of his works onto my Kindle, delivered courtesy of the airport wi-fi via Amazon’s “Whispernet” technology in a matter of seconds. Currently, I have Tolstoy’s Anna Karenina, Arnold’s Culture and Belief, Homer’s The Odyssey, Aristotle’s Poetics, and the entire New Oxford American Dictionary packed onto my Kindle, too. And this mini-library has barely begun to crack the device’s capacity. I’m lugging these hundreds of thousands of digitized words onto a plane in…