How To Turn On Dark Mode In OSX Yosemite
OSX 10.10 Yosemite has a ton of cool new features. One of the new features in Dark Mode. This changes the default appearance of the Menu Bar and the Dock. These change from Silver to an almost Black or Dark appearance. The purpose of this is to show less light in a dark room or at night, but most people turn it on because it looks cool. I would recommend giving it a try and see how you like it. You might like it so much that you end up using it all the time.
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Macintosh
OSX 10.10.3 Yosemite