Terry Pratchett once declared the Discworld unmappable (“There are no maps. You can’t map a sense of humour.”); all the same, there is now an interactive map of principal city Ankh-Morpork for the iPad. Tor.com reports that “the map is dotted with itty-bitty little people walking around Ankh-Morpork, doing their Ankh-Morpork business. Walking around, being themselves. … While many of these figures are indistinct civilians, the city is full of characters from the Discworld novels. Of course Death is there … ” Costs $14; requires iOS 6.