Everyone who has heard, seen or read the Hitchhiker’s Guide to the Galaxy remembers the eponymous Guide, a source of vast and questionable knowledge, which bailed out or confused the travelers, time and again. You don't have to travel to Ursa Minor Beta in order to score an analog, either. If you own an Android device, preferably a tablet, getting your book ready only requires three apps and approximately 2.5 to 7 GB of free space on your device or SD card.
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