The ability to integrate computing and communications functions will be vital as the PC industry stagnates and the market for smartphones and tablets is turning into a battle royale that has sucked in everyone from PC software titan Microsoft and online bookseller Amazon to search advertising titan Google, Korean tech conglomerate Samsung, and, of course, Apple.

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Samsung's Nexus Prime is the latest in a series of smartphones produced by the Korean company, running Google's Android operating system.

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Apple showed emails noting that Google said early Samsung tablets too closely resembled the iPad and asked the Korean company to tweak its designs.

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Hwang Min-woo, a 28-year-old South Korean who contributed to the North Korea map, said he began working on it after trying to use Google Maps on a trip to Laos four years ago and finding it inadequate.

WSJ: Google Maps Details Streets, Prison Camps in North Korea