Amazon has made official the return of a device many thought was bound for the e-reader graveyard, the Kindle DX. The DX is Amazon’s big-screen reader, with a 9.7-inch e-ink display and a full keyboard at the bottom. It’s almost comically oversized compared to the more popular and current e-reader models, which include the Kobo Aura HD and Amazon Kindle Paperwhite, and the technology within is now almost three years old.