Al Gore has teamed up with two former Apple engineers to create an app that aims to redefine the ebook. Push Pop Press, a company set up by former Apple employees Kimon Tsinteris and Mike Matas, has published Our Choice, an app version of Gore’s 2009 book about global warming. The app, according to Push Pop Press, “will change the way we read books”. It combines high quality photography with interactive graphics and animations. There is narration from Gore himself and more than an hour of video. The Push Pop Press publishing platform “opens doors to telling a story with...