It’s an experiment that has made back-to-school a little easier on the back: Amazon.com gave more than 200 hundred college students its Kindle e-reading device this fall, loaded with digital versions of their textbooks. However, some students are finding they miss the decidedly low-tech conveniences of paper — highlighting, flagging pages with sticky notes and scribbling in the margins. “I like the aspect of writing something down on paper and having it be so easy and just kind of writing whatever comes to my mind,” says student Claire Becerra.