Every spring, local residents have staged a play based on To Kill a Mockingbird in this courthouse in Monroeville, Ala. Debbie Elliott/NPR hide caption

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The e-book's original cover image was used without permission, according to a lawsuit filed against Amazon, Barnes & Noble and Apple. Amazon via The Daily Beast hide caption

itoggle caption Amazon via The Daily Beast

Lamya Kaddor teaches Islamic studies in Germany. She's written a new book, Zum Toeten Bereit (Ready To Kill), about the experience of having five former students flee to Syria to join jihadist groups. Andre Zelck/Courtesy of Piper Verlag GmbH hide caption

itoggle caption Andre Zelck/Courtesy of Piper Verlag GmbH

Fans are celebrating World Book Day on Thursday. Here, a man browses through books at the Albertine, a French bookstore and library at the French Embassy in New York. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

Harper Lee, seen here receiving the Presidential Medal of Freedom in 2007, actually wrote Go Set a Watchman first. But she set it aside when her editor suggested focusing on Scout's flashbacks instead — and she did, in what became To Kill a Mockingbird. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Sleepy in the day and wide awake at night? Give the screen a rest. Guido Mieth/Getty Images/Flickr RM hide caption

itoggle caption Guido Mieth/Getty Images/Flickr RM

It's clear from this child's reckless nighttime e-reading that someone has not kept up with their subscription to the Proceedings of the National Academy of Sciences. Mari/iStock hide caption

itoggle caption Mari/iStock