Think you know everything there is to know about OS X? Here’s a list of secret features and shortcuts known only by the most elite nerds. Test your knowledge and see if you are a good candidate to stand at the Genius Bar and wear a clever T-shirt.

We’ll start with some simple features before moving on to the more obscure. Topics covered include downloading YouTube videos using Safari, accessing an entire second clipboard, placing widgets on your desktop, and taking control of your system volume!

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