The Curiosity Rover Celebrates a Year on Mars by Singing Happy Birthday. To Itself.

http://news.discovery.com/space/curiosity-sings-happy-birthday-to-itself-on-mars-video-130805.htm

The Curiosity Rover is programmed to vibrate its sampling sifter mechanism to create specific tones which move certain kinds of particles away from the dirt so it can analyze them better. On its birthday it used this technology to vibrate to the tune of happy birthday. We can only hope that no one else heard it.

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