The Jungle Book author Rudyard Kipling did explain how the leopard got its spots and camel its hump, but he never answered how the zebra got its stripes.
Without too much fuss, Apple released a new version of its OS X operating systems for Mac computers. The great thing about it is, that it's completely free for the existing Mac OS X users.
You just bought Nexus 4 and you don't know anything about Android operating system, so I will guide you through literally first steps on this great phone.