Geek Trivia: What Subtle Message Does Mars Rover Curiosity’s Wheels Leave Behind?

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What Subtle Message Does Mars Rover Curiosity’s Wheels Leave Behind?
  1. (CES) Carl Edward Sagan
  2. (NASA) National Aeronautics and Space Administration
  3. (RDB) Ray Douglas Bradbury
  4. (JPL) Jet Propulsion Lab

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