E-readers like the Amazon Kindle can only do one thing, but they do it very well: they make the reading of digital books as easy on the eyes as the reading of Paper books. They have screens that look just like paper, viewable from any angle, viewable even in direct sunlight, and battery life measured in weeks. If you read ebooks and haven’t switched to E-Ink yet, then you’re seriously missing out. How do these special screens work? What makes them so much better for reading? How do they manage such impressive battery times? And should you invest in one yourself? Here’s...