NASA's Curiosity Rover celebrated its first anniversary on Mars this week—measured in Martian years rather than Earth years. To mark the day, the Rover took another in a series of selfies to show those back home what it's up to. In 2012, the first African-American to head NASA on a permanent basis, Charles Bolden, used the Rover's transmitting powers to also become the first human being to have his voice broadcast on Mars' surface.
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